Using the formula F = (9/5)C + 32, when C = F, we get C = (9/5)C + 32, solving gives C = -40°

Time by train = 1.5 h; Time by bus = 1 h; Total distance = 90 km; Total time = 2.5 h; Average = 90/2.5 = 36 km/h

x² - 5x + 6 = (x-2)(x-3) = 0; x = 2 or x = 3

After 10% discount: 90%; After 15% on 90%: 90% × 85% = 76.5%; Overall discount = 23.5%

Work rate = 1/12 + 1/15 = 5/60 + 4/60 = 9/60 = 3/20; Time = 20/3 ≈ 6.67 hours

Interest in 2 years = A₂ - A₄/2 = 1800 - 1050 = 750; Interest per year = 375; Principal = 1800 - 750 = 1500

South Eastern Railway covers the maximum geographical area among all railway zones.

Rajdhani Express was the first premium service introduced by Indian Railways.

The standard platform height on Indian railways is 750 mm above rail level.

South Coast Railway was formed as a new railway zone in 2019 with headquarters in Visakhapatnam.