# A car travels a distance of 15 km in 20 minutes. Find the speed of the car in $$ m s^{-1} $$

#### Speed of car in $$ m s^{-1} $$

Convert 15 km into meters

1 km = 1000 m

15 km = $$ 1000 \times 15 $$ = 15000 m ......(i)

Convert minutes into seconds

1 minutes = 60 sec.

20 minutes = $$ 60 \times 20 $$ = 1200 sec ........ (ii)

Speed of car = $$ \dfrac{distance}{time} $$

Speed of car = $$ \dfrac{15000 m}{1200 sec} $$ = $$ 12.5 m s^{-1} $$