Question

How many seconds will a boy take to run one complete round around a square field of side 19 metres, if he runs at a speed of 2 km/h?

• A. 136.8
• B. 141
• C. 144
• D. 138

Answer 1

Answer:

A. 136.8

Side of Square $a = 19 m$

Perimeter of field $=4a$

$=4\times{19}=76m$

$Speed = 2km/h$

$= 2\times{\frac{5}{18}}=\frac{5}{9}$m/s

Time Taken $= \frac{76}{\frac{5}{9}}$

$=136.8 sec$