How long will a man take to make a round of a circle field of radius 31.5 m, walking at the speed of 5 km/hr?
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Speed = distance / time
so, time = distance /speed
here , distance = 2πr = 2×22/7×31.5=>198 m
speed = 5km/h = 5×5/18 = 25/18 = 1.38m/s
t = 2πr/1.38 m/s
t = 198/1.38m/s => t = 143.7 sec or 2 minute nd 23 sec
hope this helps
so, time = distance /speed
here , distance = 2πr = 2×22/7×31.5=>198 m
speed = 5km/h = 5×5/18 = 25/18 = 1.38m/s
t = 2πr/1.38 m/s
t = 198/1.38m/s => t = 143.7 sec or 2 minute nd 23 sec
hope this helps
kumarisimran83p5kwud:
I don't understand... How speed =5km/h= 5×5/18
Answered by
0
Answer:
The answer is 2.38 minutes
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