there are two concentric circular tracks of radius 100m and 102 respectively. a runs on the inner track and goes once around the track in 1 minute 30 seconds;while b runs the outer track in 1 minutes 32 seconds who runs faster?
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Step-by-step explanation:
given: inner radius=100m
outer radius =102m
runner "a"=1 min 30 sec= 1×60+30=130 sec, runner"b"=1 min 32 sec=1×60+32 sec=132 seconds
now, distance covered by a= 2πr
a= 2×22×100/7
a=628.57 -(1)
speed of runner a= distance/ time= 628.57m/130s=4.83 m/s
distance covered by body b=2πR
2×22×102/7
=641.14
speed of body b= distance/time
641.14/132=4.85m/s
hence body b ran faster than a
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