A man runs around a circular field of radius 50 cm at an speed of 12 km/hr. What time is taken by the man to make twenty rounds of the field ?
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Answered by
0
Circumference=2*π*50
= 100*π
=314m=0.314km
Time taken=dist./speed
314/1000 * 12 = 0.26hr= 15.6mins
Answered by
1
Answer:
Step-by-step explanation:
Circumference of circle=2πr
=2×22/7×1/2
=22/7m
Distance covered in 20 rounds=20×22/7
=440/7m
Speed=12km/hr
=12×5/18
10/3 m/sec
TIME=DISTANCE/SPEED
=440/7×3/10
132/7 SEC
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