Question

Which one of the following has the maximum and the least average speed?

1. Sanjeev moving with 12 km/h
2. Rajeev running with 5 m/s
3. Kabir moving with 150 m/min

Answer 1

First convert them into the same unit which is m/s, as it is the SI unit of speed.

1. average speed= 12 km/h = 3.34 m/s
2. It is already in m/s, average speed = 5 m/s
3. 150 m/min must be changed in m/sec, average speed.= $\frac{150}{60}=2.5\mathrm{m}/\mathrm{s}$

From the above calculation, we can conclude that

$5\mathrm{m}/\mathrm{s}>3.34\mathrm{m}/\mathrm{s}>2.5\mathrm{m}/\mathrm{s}.$

Hence, Rajeev has maximum average velocity, and Kabir has minimum.