A. 2.5 seconds

B. 4.25 seconds

C. 5 seconds

D. 12.5 seconds

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:

A watch gains 12 seconds every 3 hours, what time will it show at 10 A.M. on Tuesday if the watch is set right at 3 A.M. on Sunday?