Question

A tourist bus takes 4 hours 50 minutes to reach Agra from Delhi.
However, on 3 March it broke down on the way and took 1 hour
30 minutes longer. What was the duration of the journey on
3 March?​

Answer 1

Answer:

Speed(s)=distance(d)/time(t)

Let us assume the total distance travelled to be 3x.

So the car travels x distance with each speed.

Since, s=d/t,

t=d/s

So the total time taken would be

T=x/40 + x/50 + x/60

Total distance, D=3x

Avg speed = D/T = 3x/( x/40 + x/50 + x/60 )

Cancel x from numerator and denominator and solve for average speed.