find the time taken by a boy to run around a rectangular field with length as 25 m and breadth as 15 m, if he runs at a speed of 7.2 km/h.
Answers
Answered by
2
Step-by-step explanation:
length of the rectangle = 2(l + b)
2(25+15)
2 (40)
80m
speed = 7.2/60 min
7200/60
120m/minute
time = distance/speed
80/120
2/3 minute
40 seconds
he will take 40 seconds
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Answered by
1
Step-by-step explanation:
perimeter of the rectangular field= 2(l+b)
=2(15+25)m
=80m
speed of boy =7.2km/h
=2m/s
Now,
He covers 2m in 1sec
He covers 1m in (1/2)sec
He covers 80m in (1/2*80)sec
=40sec..... Ans
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