A car covers the first 30 km of a 150km journey at a speed of 30km/h. What should be the speed of the train in the next part of the journey to average its speed to 50km/h?
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Answer:
60km/hr
Explanation:
as, 120km are left and to make the average 50 we will add 60+60+30/3
=150/3
so 50km/hr is the average.
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