Question 1187160
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A train is going at 1/4 of its usual speed and it take an extra 45 minutes to reach its destination. 
Find its usual time to cover the same distance.
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Let t be the usual time, in minutes.


When the train moves at 1/4 of the usual speed, the travel time is 4 times the usual time, i.e. 4t minutes.


We are given  4t - t = 45 minutes,  which gives  3t = 45 minutes  and  t = 45/3 = 15 minutes.


<U>ANSWER</U>.  Usual time is 15 minutes.
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Solved.