Question

PT Usha runs around a circular path of area 754 600 square metre how long will it take to run 20 rounds at the speed of 16 km per hour

Answer 1

area of a circle = 754600 m^2
22/7 × r^2 = 754600
r^2 = (754600×7)/22 = 34300×7
r =
$\sqrt{34300 \times 7}$
=49×10= 490m
circumference of circular path = 22/7 × 2 × 490
= 1760 m
distace covered in 20 rounds = 1760 × 20 m= 53.2 km
speed = 16 km/h
time taken = 53.2/16 = 3.325 h

Answer 2

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