Question

. A man runs round a circular field of radius 50 m at a speed of 12 km/hr. What time is taken by the
man to make twenty rounds of the field?
(a) 30 min
(b) 32 min.
(c) 34 min.
(d) 31 3/7 min.​

Answer 1

Answer:

distance coved in one round = 2π r

= 2 x 22/7 x 50 = 314.28m

speed = 12km/h = 10/3 m/s

distance in 20 rounds = 20 x 314.28 = 6285.6 m

time taken = distance/speed

= 6285.6 x 3 / 10 = 1885.68 seconds..

= 31.428 minutes (approx) that is 32 min..

thus 32 min will be the answer..

Answer 2

Answer:

33 minute is your answer hope it helpfull