Question

A and b are 15 kms apart and when travelling towards each other meet after half an hour whereas they meet two and a half hours later if they travel in the same direction. the faster of the two travels at the speed of

Answer 1

Let a speed = a
And b = b
Let a > b

If in opp. Direction
15/a+b = 1/2
a + b = 30. . . . . . Eq 1

If in same direction
15/ a- b= 2 1/2 hr
15 / a- b = 3/2
3a - 3b = 30
a - b = 10.............. Eq 2

Solving eq 1 and 2
We get a =40
And b = 20

The greater one is having 40 kmph speed

Answer 2

Answer:

Step-by-step explanation:

Let a speed = a

And b = b

Let a > b

If in opp. Direction

15/a+b = 1/2

a + b = 30. . . . . . Eq 1

If in same direction

15/ a- b= 2 1/2 hr

15 / a- b = 5/2

5a - 5b = 30

a - b = 6.............. Eq 2

Solving eq 1 and 2

We get a =18

And b = 12

The greater one is having 18 kmph speed