Entrance Exams
Govt. Exams
SI = P × R × T / 100. 1200 = P × 8 × 3 / 100. P = (1200 × 100) / 24 = 5000.
Original time = 480/60 = 8 hours. New speed = 72 km/h. New time = 480/72 = 6.67 hours. Time saved = 8 - 6.67 = 1.33 ≈ 1 hour (approximately 1 hour 20 minutes).
Let number = 100. After 40% increase = 140. After 30% decrease = 140 × 0.7 = 98. Net change = 102 - 100 = 2% increase.
Discount = 30% of 1000 = 300. Selling price = 1000 - 300 = Rs. 700
If 25% = 80, then number = 320. 60% of 320 = 0.6 × 320 = 192
SI = (5000 × 12 × 3)/100 = 1800. Amount = 5000 + 1800 = Rs. 6800
Speed of current = (Downstream speed - Upstream speed)/2 = (12 - 8)/2 = 2 km/h
Time = Distance/Speed = 300/60 = 5 hours
Combined rate = 1/15 + 1/10 = 2/30 + 3/30 = 5/30 = 1/6. Time = 6 hours
A's work rate = 1/20, B's work rate = 1/30. Combined rate = 1/20 + 1/30 = 5/60 = 1/12. Time = 12 days