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Take the horse to overtake the 17. A car completes a journey at an average speed of 40 km/h. At what speed must it travel on the return journey if the average speed for the comp…
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Take the horse to overtake the 17. A car completes a journey at an average speed of 40 km/h. At what speed must it travel on the return journey if the average speed for the comp…
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Sep 27, 2021
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Take the horse to overtake the
17. A car completes a journey at an average speed of 40 km/h. At what
speed must it travel on the return journey if the average speed for the
complete journey (out and back) is 60 km/h?
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Mathematics
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Stephen Mulcahy
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Answer:
120 km/h
Explanation:
Speed in one direction = 40 km/h
Speed on return = x
Average speed = 60 km/h
Let the distance be d
Average speed
2d/(d/40 + d/x) = 60
d/40 + d/x = 2d/60
1/40 + 1/x = 1/30
1/x = 1/30 - 1/40
1/x = (4-3)/120
1/x = 1/120
x = 120 km/h
MemC
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Oct 4, 2021
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MemC
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