Question

69. In covering certain distance, the
average speeds of X and Y are in the
ratio 4: 5. If X takes 45 minutes more
than Y to reach the destination, then
what is the time taken by Y to reach
the destination ?
(a) 135 minutes
(b) 150 minutes
(c) 180 minutes
€ (d) 225 minutes​

Answer 1

Answer:

(b)180 minutes

Step-by-step explanation:

Given ratio of speed is 4:5

Therefore

Speed of X = 4a

Speed of Y = 5a

We have,

Speed = distance / time

But both X and Y have to cover same distance

Therefore, distance = constant

Speed is inversely proportion to speed

Let speed of X= V1=4a

Let speed of Y= V2=5a

Let time taken by X be t1 and

By Y be t3

Given t1=t2+45

Therefore

V1/V2=t2/t1

4a/5a=t2/t2+45

4/5=t2/t2+45

t2=180