A train moving at the speed of 72 kmh-1 crosses a bridge in 20 seconds. Another train 40 metres shorter moving at the speed of 18 kmh-1 crosses the same bridge. Find the time taken by the second train to cross the bridge.
A shopkeeper purchased 120 kg of grain at the rate of 15 per kg from a wholesaler. He sold 60 kg at the profit of 10%. At what rate per kg should he sell the remaining grain to earn a profit of 15% on the total deal ?
A started a work and left after working for 5 days. Then B finished the remaining work in 16 days. Had A left the work after working for 8 days, B would have finished the remaining work in 10 days. In how many days can each of them alone finish the whole work ?
45 men working 5 hours per day finish a piece of work in 12 days. In how many days can 60 women working 4 hours per day finish the same piece of work? 2 women do as much work in one hour as 1 man does in 1.5 hours.