Latest self Aptitude Question SOLUTION: Two cars start at the same time from A and B which are 120 km apart. If the two cars travel in opposite direction they meet after one hour and if they travel in same direction ( fr

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(#M40007823) SELF question Time,Speed,Distance Keep an EYE

Two cars start at the same time from A and B which are 120 km apart. If the two cars travel in opposite direction they meet after one hour and if they travel in same direction ( from A towards B) then A meets B after 6 hours. What is the speed of the car starting from A?
a) 70 kmph
b) 120 kmph
c) 60 kmph
d) Data Inadequate
e) None of these

Khushboo Porwal (12 years ago)

Solved Vignesh Read Solution (2)

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Vignesh  (12 years ago)

a)70kmph

Let, speed of car from A towards B = x km/ph
Let, speed of car from B towards A = y km/ph

Two cars start at same time which 120km apart = x + y = 120-----(i)
Travel in same direction, A meets B after 6hr = 6x-6y = 120-----(ii)

By Solving equation (i) and (ii), we get
12x = 840
x = 840/12
x = 70km/ph
Substituting x value in eqn (i) or (ii), we get
y = 50km/ph.

So, speed of car starting from A is 70kmph.

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Dolly  (12 years ago)

If they are travelling in same direction, they meet after 6 hrs.

so relative speed = diff in speeds , A-B = 120/6 = 20 kmph
They meet when travel in opposite direction in 1 hr,
in that case relative speed= sum of speeds = A+B= 120/1=120

so 2A =140
A=70 kmph

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