A child walks 60 metres in 30 seconds. What is his speed in metres per second and in kilometres per hour?

easy 1 mark Class 6 · Science · Motion and Measurement of Distances

Answer

2 m/s and 7.2 km/h

The correct answer is 2 m/s and 7.2 km/h — Convert 2 m/s to km/h by multiplying by 3.6 (since 1 m/s = 3.6 km/h): 2 × 3.6 = 7.2 km/h.

Step-by-step solution

Compute speed in m/s by dividing distance by time: 60 m ÷ 30 s = 2 m/s.
Convert 2 m/s to km/h by multiplying by 3.6 (since 1 m/s = 3.6 km/h): 2 × 3.6 = 7.2 km/h.

Common mistake: forgetting to multiply by 3.6 for unit conversion

Concept tested: average speed