A boy travels with a speed of 10 m s -1 for 30 minute. How much distance does he travel?

Speed = 10 m s -1 time = 30 minutes 1 min = 60 sec 30 min = 60 x 30 = 1800 sec distance = ? So, distance travelled = 18000 m or 18 km.

A car travels a distance of 15 km in 20 minute. Find the speed of the car in:
(i) km h^-1
(ii) m s^-1