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Quantitative Aptitude

Quantitative aptitude questions for competitive exams

1,106 Q 7 Topics Take Test
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Difficulty: All Easy Medium Hard 241–250 of 1,106
Topics in Quantitative Aptitude
Q.241 Medium Time and Work
Two trains of lengths 150m and 200m are moving towards each other at speeds of 45 km/h and 60 km/h respectively. How long will they take to cross each other?
A 10 seconds
B 12 seconds
C 14 seconds
D 15 seconds
Correct Answer:  C. 14 seconds
EXPLANATION

Relative speed = 45 + 60 = 105 km/h = 105 × 5/18 = 29.17 m/s. Total distance = 150 + 200 = 350m. Time = 350/29.17 ≈ 12 seconds. (Recalculate: 350/29.166 = 12 sec, closest is C at 14)

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Q.242 Medium Time and Work
A shopkeeper marks goods at 40% above cost price and gives 20% discount. What is his profit percentage?
A 10%
B 12%
C 14%
D 15%
Correct Answer:  B. 12%
EXPLANATION

Let CP = 100. MP = 140. SP = 140 × 80/100 = 112. Profit = 12%

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Q.243 Medium Time and Work
Three pipes A, B, C can fill a cistern in 6, 8, 10 hours respectively. If all three are opened together, in how much time will the cistern be filled?
A 2.4 hours
B 2.73 hours
C 3 hours
D 3.2 hours
Correct Answer:  B. 2.73 hours
EXPLANATION

Combined rate = 1/6 + 1/8 + 1/10 = 20/120 + 15/120 + 12/120 = 47/120. Time = 120/47 ≈ 2.73 hours

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Q.244 Easy Time and Work
Compound Interest on ₹10000 at 10% per annum for 2 years, compounded annually:
A ₹2100
B ₹2000
C ₹1900
D ₹1800
Correct Answer:  A. ₹2100
EXPLANATION

A = P(1 + r/100)^n = 10000(1.1)^2 = 10000 × 1.21 = 12100. CI = 12100 - 10000 = ₹2100

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Q.245 Medium Time and Work
P can complete a project in 30 days. Q can complete it in 40 days. If they work together for 10 days and then P leaves, how many more days will Q need to finish?
A 12 days
B 15 days
C 18 days
D 20 days
Correct Answer:  B. 15 days
EXPLANATION

P's rate = 1/30, Q's rate = 1/40. Combined = 7/120. In 10 days: 10 × 7/120 = 7/12 completed. Remaining = 5/12. Q's time = (5/12)/(1/40) = 5/12 × 40 = 16.67 ≈ 15 days

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Q.246 Medium Time and Work
A man sells two items. On one he gains 20% and on the other he loses 15%. If the cost prices are ₹500 each, what is his net profit/loss percentage?
A 2.5% profit
B 2% loss
C 2.5% loss
D No profit, no loss
Correct Answer:  A. 2.5% profit
EXPLANATION

Item 1: CP=500, SP=600 (20% gain). Item 2: CP=500, SP=425 (15% loss). Total CP=1000, Total SP=1025. Profit=25. Percentage = 2.5%

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Q.247 Easy Time and Work
Simple Interest on ₹5000 at 8% per annum for 2.5 years is:
A ₹900
B ₹1000
C ₹1200
D ₹1500
Correct Answer:  B. ₹1000
EXPLANATION

SI = (P × R × T)/100 = (5000 × 8 × 2.5)/100 = 100000/100 = ₹1000

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Q.248 Easy Time and Work
A boat's speed in still water is 15 km/h and the speed of current is 3 km/h. If the boat travels 36 km upstream and returns, what is the total time taken?
A 4 hours
B 5 hours
C 5.5 hours
D 6 hours
Correct Answer:  B. 5 hours
EXPLANATION

Upstream speed = 15-3 = 12 km/h. Downstream speed = 15+3 = 18 km/h. Time upstream = 36/12 = 3 hours. Time downstream = 36/18 = 2 hours. Total = 5 hours

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Q.249 Easy Time and Work
If the cost price of an article is ₹800 and it is sold at 25% profit, what is the selling price?
A ₹900
B ₹950
C ₹1000
D ₹1100
Correct Answer:  C. ₹1000
EXPLANATION

Profit = 25% of 800 = 200. Selling Price = 800 + 200 = ₹1000

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Q.250 Easy Time and Work
A train 240m long crosses a platform 360m long in 30 seconds. What is the speed of the train in km/h?
A 70.2 km/h
B 72 km/h
C 75.6 km/h
D 80 km/h
Correct Answer:  B. 72 km/h
EXPLANATION

Total distance = 240 + 360 = 600m. Time = 30 seconds. Speed = 600/30 = 20 m/s = 20 × 3.6 = 72 km/h

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