Answers

2014-03-10T10:19:30+05:30
 \pi r^2=15m^2
22/7r^2=154
r^2=49
r=7m
Circumference2 \pi r=2*22/7*7=44m
2rounds=2circumference=2*44=88m=0.088km
speed=5km/hr
time=Total circumference/speed=0.088/5=0.0176hr
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how can we convert 0.0176hr into seconds
1hr=3600sec and 0.0176hr=3600*0.0176=63.36sec