Maths-
General
Easy

Question

A circle has a diameter of 120 metres. Your average walking speed is 4 kilometres per hour. How many minutes  will it take you to walk around the boundary of the circle 3 times? Round your answer to the nearest integer.

hintHint:

Given , the diameter of circle .Now find the perimeter of circle by using circumference of circle   where d is the diameter of a circle.
Now find total distance and speed is given .so, find time taken by using text  time  end text equals fraction numerator text  total distance  end text over denominator text  speed  end text end fraction formula.

The correct answer is: time = 0.1885 60 mins = 11.3097 mins (11 is the nearest integer)


    ANS :- Time taken to walk  3 times around the circle is 11 mins (approx.)
    Explanation :-
    Given , the diameter of the circle is 120 m .The no. of round need to cover = 3
    Given , the speed = 4 km / hr
    circumference of circle pi d equals 120 pi m
    The total distance = no. of rounds × circumference of circle
    The total distance 2 cross times 120 pi equals 240 pi m equals 0.24 pi km
    We get text  time  end text equals fraction numerator text  total distance  end text over denominator text  speed  end text end fraction not stretchy rightwards double arrow text  time  end text equals fraction numerator 0.24 pi km over denominator 4 km divided by hr end fraction
    hrs = 0.1885 hrs
    As we know 1 hour = 60 mins
    As  time = 0.1885 × 60 mins = 11.3097 mins (11 is the nearest integer)

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