Question

A man runs round a circular field of radius 50 m at a speed of 12km/hr.What time is taken by the man make twenty rounds of the field?
a) 30 min
b) 32 min
c) 34 min
d)217/3 min

Answer 1

Answer:

Step-by-step explanation:

Option (b) 32 minutes approx

Answer 2

Answer:

32 min

Step-by-step explanation:

1. calculate the perimeter of the circle

2 x Pi x Radius = 2 x 3.14 x 50 = 314 meters

total length = 20 rounds x 314 = 6280 meters

2. now convert the speed to meters / minutes

12 x 1000 = 12000 meters / hr

12000 / 60 = 200 meters / min

3. get the final result

6280 meters / 200 = 31.4 min (around 32 min)