Question

the length of a rectangular field is 10m more than its breath. if its length is 50 m, then find the time a boy takes to make two rounds of the field, if his speed is 1.5m per second.

Answer 1

Let, breadth be x
ATQ, x+10=50
x=40
Perimeter of rectangle = 2(l+b)
= 2(50+40)
= 180
T = D/S
T = 180/1.5
T = 12 SECONDS.
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Answer 2

Answer:

given breadth=length-10

length=50 m

⇒breadth=50-10=40 m

perimeter=2(l+b)=2(50+40)=2(90)=180 m

distance traveled by boy =2*180=360

d=s*t

t=d/s=360/1.5=240 s

∴the boy takes 4 minutes to take 2 rounds in the field