Question

A car takes 20 minutes to cover a distance of 15 km. calculate its speed in km/h and m/sec

full explanations also.

Answer 1

Step-by-step explanation:

$speed = \frac{distance}{time}$

here,

$time = 20mins = \frac{20}{60 } = \frac{1}{3} = 0.33hr$

and,

$distance = 15km$

so,

$speed = \frac{15}{0.33} = \frac{1500}{33} = \frac{500}{11} = 45.4km \: hr$

in m/s

$45.5 \times \frac{5}{18 } = 12.638 \: m \: s$

Answer 2

Answer:

45 km/hr and 12.5m/s

Explanation:

Speed = Distance / Time

= 15 km / 20 min

= 15 km / 20/60 hr

= 15 km / 1/3 hr

= 15 ×3 km/hr

= 45 km/h

again,

Speed = Distance / Time

= 15 km / 20 min

= 15 ×1000m / 20×60 sec

= 15000 m/1200 sec

= 12.5 m/sec