Two bike A & B start at the same time from salem to Rasipuram which are 60km apart. If the 2 bikes travel in opposite directions, they meet after 1 hr and if they travel in same direction(from salem towards Rasipuram), then A meets B after 3 hrs. what is the speed of bike A? a) 50 b) 70 c) 90 d) 30

1 Answer

Answer :

B

Let their speed be x km/hr and y km/hr respectively

Then 60 / (x+y) = ½

X+y = 120 ------------->1

Now when they move in same direction

(distance travelled by A in 3 hrs) – (Distance travelled by B in 3 hrs) = 60km

3x – 3y =60

X – y =20 ------------>2

Adding 1 & 2 we get

2x = 140

X=70

Put x value in 1 we get

Y=120 -70=50

Y=50

Therefore A’s speed = 70 km/hr
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