time speed and distance

Question

walking at 5/6 of its usual speed a train is 10 minutes too late find its usual time to cover the journey

 

explain me

Answer 1

Since the train has 5/6 it's usual speed, it will take 6/5 times as long as usual. We are told that this is 10 minutes longer. We can set up an equation for this.

 

(6/5)t = t + 10

 

t + t/5 = t + 10

 

t/5 = 10

 

t = 50

 

Therefore, this train usually takes 50 minutes for the trip.