NCHMCT JEE 2016 Question Paper with solutions for online practice

Question : 48 of 200

Marks: +1, -0

In a 500 m race, the ratio of the speeds of two contestants A and B is 3 : 4. If A has a start of 140 m, then A wins by ............... .

60 m
40 m
20 m
10 m

Validate

Solution:

Speed of A = 3x and Speed of B = 4x
When A has a start of 140 m
then, time t when A finished the race has covered a distance
(500 – 140) = 360 m
Time, t =

{360}/{3x}

Distance covered by B in time t
= t × 4x
=

{360}/{3x}

× x
= 480 m
Hence, A win the race by 20 m.

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