Three pipes A, B and C can fill a tank in 4 hours. After working together for 2 hours, C is closed, and A and B fill the tank in 10 hours. Then how much time will C alone take to fill the tank?

Rajeev alone can do a work in 45 days but with the help of Kisan he can do the same work in 20 days. If they get Rs. 2925 for the work, then what will be the share of Kisan?

A student goes to school at a speed of 6 kmph and returns home at a speed of 4.5 kmph. If he takes 10.5 hours in all, then how far is the school from his home?

Two trains were running in opposite directions at the speed of 48 kmph and 24 kmph respectively. If the faster train passed a man sitting in the slower train in 9.5 seconds, what is the length of the faster train?