Question

A car takes 20 minutes to cover a distance of 15 km. Calculate its speed in k/m and m/s.

Answer 1

SOLUTION :

Distance covered by a car ( s ) = 15 km

Time taken by a car ( t ) = 20 min

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{20}{60} hrs$

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{1}{3} hrs$

$\:\:\:\:\:speed = \frac{s}{t}$

$\:\:\:\:\:\:\: = \frac{15}{\frac{1}{3}}$

$\:\:\:\:\:\:= 15 × 3$

$\:\:\:\:\:\:\: = 45 km/h$

$\:\:\:\:\:\:\:= 45 × \frac{5}{18}$

= 12.5 m/s