question no 7...................
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Step-by-step explanation:
touch on the 88 cm trust me is an attachment
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Step-by-step explanation:
Radius of circular park = 7cm
A man walks around a circular park 2times
so
Distance covered
= 2*perimeter of circle
= 2*2πr
= 4πr
= 4*22/7*7
= 88cm
= 88 / 100*1000
= 8.8 *10^-6 km
Time taken = 30 minutes (given) = 30/60 hours = 0.5 hours
Speed = Distance / Time
The speed of the man in km/h
speed
= 8.8 * 10^-6 / 0.5 km/h
= 17.6 * 10^-6 km/h
is the required speed
Hope it helped
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