NCHMCT JEE 2012 Question Paper with solutions for online practice

Question : 2 of 200

Marks: +1, -0

Two cars A and B are running in the same direction. Car ‘A’ had already covered a distance of 60 kms, when car ‘B’ started running. The cars meet each other in 3 hours after car ‘B’ started running. What was the speed of car ‘A’?

40 kmph.
60 kmph.
45 kmph.
Cannot be determined

Validate

Solution:

Difference between the speeds of car ‘B’ and ‘A’ =

{60}/3

= 20 kmph
But from this result it is impossible to find the speed of car ‘A’, because here the unknowns are two but equation is only one.

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