Question

A boy covers 40 m in 10 s, 30 m in next 10 s and 20 m in last 10 s. The average speed of the boy is

Answer 1

Answer:

hahahaha so easy.......

Answer 2

Explanation:

$average = sum \: of \: observations \: \div number \: of \: observations$

$so$

$a = (50 + 40 + 30) \div 30 \\ = 120 \div 3$

$so$

$the \: average \: speed \: of \: the \: boy \: is \: 40m \: per \: 10 \: second$