Ram can row downstream 20 km in 2 hours and upstream 4 km in 2 hours. The speed of the stream is:

A car starts from rest and accelerates uniformly at 2 m/s2 for 5 seconds. What is the velocity at the end of 5 seconds?

A car covers 20 km in the first quarter of an hour, 25 km in the second quarter of that hour, and 30 km in the third quarter of that hour. The average speed of the car (in km/h) over the total journey time of 0.75 hours is: