1/3 of a certain journey is covered at the rate of 25km/h, 1/4 at the rate of 30 km/h and the rest of 50 km/h. What is the average speed of the whole journey?
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1/3 of a certain journey is covered at the rate of 25km/h, 1/4 at the rate of 30 km/h and the rest of 50 km/h. What is the average speed of the whole journey?
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Answer:
Let the total distance = 1200 km
Total time taken
=40025+30030+50050
16+10+10=36 hours
Average speed = TotaldistanceTotaltime
=120036=3313 km/hr
Explanation:
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