Question

Walking at 5/6 of its usual speed, a train is 10 minutes too late. Find its usual time to cover the journey.

Answer 1

New time must be 6/5 of old time (t) as the speed was reduced to 5/6 of the old speed (s)

Thus,

6/5(t) - t = 10

1/5t=10

t= 50 minutes

Answer 2

$\frac{6}{5} t - t = 10$

so may be the answer is

$50 \: \: mins$

hope you get it ✌️