Question

A car is moving at a speed of 20 ms-1
, its speed in kmh-1 will be
(a) 36 (b) 50 (c) 72 (d) 100

Answer 1

Answer: (b) 50

Explanation:

Answer 2

The speed in kilometer/hour is 72 kmh-1.

Option (d) is correct.

Explanation:

The speed of moving car = 20 m/s

As we know that

1 km = 1000 m  

Now convert it into kilometer per hour.

Multiply 20 by 18

20 x 18 = 360

Now divide 360 by 5 in order to get the required value.

360 /5 = 72

Thus the speed of the car in km/h is72.