A. 7 hours

B. 8 hours

C. 14 hours

D. 16 hours

In what time will a train 100 meters long cross an electric pole, if its speed be 144 km/hr?

A 120m-long train crosses a 30-long bridge in 7.5 seconds. What is the speed of that train in km/h?

A salesman travels a distance of 50 km in 2 hours and 30 minutes. How much faster, in kilometers per hour, on an average, must he travel to make such a trip in 5/6 hour less time?

A train covers a distance of 12 km in 10 minutes. If it takes 6 seconds to pass a telegraph post, then the length of the train is

River is running at 3 kmph. It takes a man twice as long to row up as to row down the river. The rate of the main in still water is: