Question

A man runs 20 km in 30 min. What is his speed? (A) 40 m/s (B) 11.11 m/s (C) 20 m/s (D) 111.1 m/s​

Answer 1

Answer:-

• Distance=30km
• Time=30min=1/2hour

We know that

$\boxed{\sf Speed=\dfrac{Distance}{Time}}$

$\\ \sf\longmapsto Speed=\dfrac{30}{\frac{1}{2}}$

$\\ \sf\longmapsto Speed=30\times 2$

$\\ \sf\longmapsto Speed=60km/h$

$\\ \sf\longmapsto Speed=60\times \dfrac{5}{18}$

$\\ \sf\longmapsto Speed=16.6m/s$

Answer 2

Answer:

As we know the formula of Speed that is distance divided by time,

Speed = Distance / Time = 20*60/30*5/18 m/s= 1200/30*5/18=40*5/18=200/18=11.11 m/s