Then, A Meet B and C at Times: If

A, B  and C walk 1 km in 5 min, 8 min  and 10 min, respectively. C starts walking from a point, at a certain time, B starts from the same point 1 min later and A starts from the same point 2 min later than C. Then, A meet B  and C at times

  1. 2 min, 3 min
  2. 4/3 min, 3 min
  3. 2 min, 5/3 min
  4. 1 min, 2 min
Anurag Mishra Professor Asked on 1st August 2015 in Maths.
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  • 1 Answer(s)
    Best answer

    Answer: (3) 2 min, 5/3 min
    Explanation:-
    Let the A meets B and C in  X & Y min.

    The distance covered by A in 5 min = 1 km
    Then, the distance covered by A in 1 min = 1000/5 = 200 m.

    The distance covered by B in 8 min = 1 km
    Then, the distance covered by B in 1 min = 1000/8 = 125 m.

    The distance covered by C in 10 min = 1 km
    Then, the distance covered by C in 1 min = 1000/10 = 100 m.

    According to the question,
    Distance covered by C in (X + 2) min = the distance covered by  in X min
    Then, 100 (X + 2) = 200 X
    100 X + 200 = 200 X
    200 = 200 X – 100 X
    100 X = 200
    X = 200/100
    X = 2 min.

    Now, for A & B
    Distance covered by B in (Y + 1) min = Distance covered by A in Y min
    Then, 125( Y + 1) = 200 x Y
    125 Y + 125 + 200 Y
    125 = 200 Y – 125 Y
    125 = 75 Y
    Y = 125/75
    Y = 5/ min.

    Hence, the answer is (3) 2 min, 5/3 min.

    Anurag Mishra Professor Answered on 1st August 2015.
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