Question

a takes 30 minutes more than B to cover a distance of 15 kilometre at a certain speed but if a speed it takes 1 hours less than B to cover the distance what is the speed of B​

Answer 1

The speed of B is 7.5 Km/hr.

Step-by-step explanation:

Let the speed of A be x and that of B be y

Therefore 30/x - 30/y = 2

30/2x -30/y = -1

On solving we get

x = 5 km/hr and y = 7.5 km/hr

• Let the speed of A be x km/hr.
• Let the speed of B be y km/hr

We know that

• Speed = Distance / time
• Time = Distance / speed

Hence

30/x-30/y=2    ............(1)

30/x-30/2x=1    ............(2)

Adding equation (1) and (2) we get

Then, 30 - 30 = 3 x 2x

Image 6x = 30

Image x = 5 km/hr

Thus the speed of B is 7.5 Km/hr.

Also learn more

A fast train takes one hour less than a slow train for a journey of 200 km if the speed of the slow train is 10 km/ h less that of the fast train find the speed of two train ?

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