Quantitative Aptitude - Arithmetic Ability Questions

A man can row upstream at 12 km/hr and downstream at 18 km/hr. The man's rowing speed in still water is

The distance between places U and V is 1008 km. An express train leaves place U at 9:00 a.m. and runs at a speed of 126 km/hr. The train stops on the way for 20 minutes. At what time (in p.m.) the train will reach at the place V?

A boy running at 10/9 th of his actual speed covers 39 km in 2 hours 20 minutes and 24 seconds. Find the actual speed of the boy (approx.)

In the following question, select the odd letters from the given alternatives.

If (5x – y)/(5x + y) = 3/7, then what is the value of (4x2 + y2 – 4xy)/(9x2 + 16y2 + 24xy) ?

If (x2/yz) + (y2/zx) + (z2/xy) = 3, then what is the value of (x + y + z)3?

If x - y = -6 and x + y = 16, then x2- y2 is?

What is the value of cosec 3π/4?