A train travels at a certain average speed for a distance of 63 km and then travels a distance of 72 km at an average speed of 6 km/hr more than its original speed. If it takes 3 hours to complete…
Question and options
A train travels at a certain average speed for a distance of 63 km and then travels a distance of 72 km at an average speed of 6 km/hr more than its original speed. If it takes 3 hours to complete the total journey, what is the original speed of the train in km/hr?
- 24
- 33
- 42
- 66
Answer and explanation
Correct answer: C - 42
Let speed be : . Testing : and , total 3 hours. So the original speed is 42 km/h.
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