Question

Delhi at a distance of 250 km from Chandigarh. A sets out from Chandigarh at a speed of 89 km per hour and B sets out at the same time from Delhi at the speed of 45 km per hour . A and B meet at time?

Answer 1

take relative speed
i.e the speed of A with respect to B is speed of A +speed of B
so the speed of A with respect to B is 124km/h
so the time taken to meet is 250/124

Answer 2

Answer:

They will meet after 1.86 hr from the start.

Explanation:

Given that,

Distance = 250 km

The speed of A = 89 km/hr

The speed of B = 45 km/hr

The relative velocity of A w.r.to b

$v_{ab}=v_{a}-v_{b}$

$v_{ab}=89-(-45)$

$v_{ab}= 134\ km/hr$

For the time ,

Using formula of distance

The speed is equal to the distance upon time.

Now, time taken to cover a distance of 250 km with a speed of 134 km/hr is

$t=\dfrac{250}{134}$

$t = 1.86\ hr$

Hence, They will meet after 1.86 hr from the start.