Postal or Sorting Assistants Model Paper 1 With Solutions

Question : 24 of 100

Marks: +1, -0

A man riding a bicycle, completes one lap of a circular field along its circumference at the speed of 79.2 km/hr in 2 minutes 40 seconds. What is the area of the field?

985600 sq metre
848500 sq metre
795600 sq metre
804550

Validate

Solution:

79.2 km/hr

= 79.2 ×5/18=22

m/s
2 min 40 sec

= 2 x 60 + 40 = 120 + 40 = 160

sec.
=

22×160 = 3520

m
Radius of circular field (r) =

\text"circumference"/{2π}

={3520×7}/{2×22}=560

m
Area of circular field

= πr^2=22/7×(560)^2

22/7×560×560

985600 m^2

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