Question
If a train runs at a uniform speed that is equal to
three-fourth of its usual speed, then it reaches its destination 1 hour 45 minutes late. How much time will the train take to reach its destination if it runs at its usual speed?Solution
The ratio of Initial speed to Final speed = 4 ∶ 3 ⇒ the Ratio of Initial Time to Final Time = 3 ∶ 4 ⇒ The difference in time = 1 ⇒ 1 = 7/4 ⇒ Actual time taken = 3 × 7/4 = 21/4 = 5hrs 15 min
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