Question

Two particles P and Q get 6 m closer each
second while travelling in opposite directions.
They get 2.4 m closer every second while
travelling in the same direction. The speeds of
P and Q are respectively:
KERALA PET 2006
(a) 4.2 ms and 1.8 ms
(b) 6 ms and 2.4 ms
(C) 8.4 ms' and 3.6 ms!
(d) 4.2 ms and 3.6 ms-!​

Answer 1

Answer:

4.2 ms and 1.8 ms is right answer

Answer 2

Answer:Velocity of one car = 4.2m/s

Velocity of second car = 1.8m/s

Explanation:

The relative velocity of one car w.r.t other car moving in opposite direction, v12 = v1 + v2

Distance travelled in one second, d = 6m

v1 + v2 =6m....(1)

Relative velocity of one car w.r.t other car moving in same direction, v12' = v1 - v2

Distance travelled in one second, d' = 2.4m

v1 - v2 = 2.4m ...(2)

Adding the two equations,

Velocity of one car = 4.2m/s

Velocity of second car = 1.8m/s

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