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Maths Puzzle
Geometry
A car travels a distance of 1742 miles at an average rate of 40 mph and returns at an average rate of 55 mph. Find the average rate for the roundtrip to the nearest tenth.
Read Solution (Total 1)
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- 46.31 mph
Time taken for two trips are 1742/40 & 1742/55
Total distance of round-trip=2*1742
So average rate of speed=2*1742/[(1742/40)+(1742/55)]
=3484/[(43.55)+(31.67)]=3484/75.22=46.31 - 10 years agoHelpfull: Yes(0) No(0)
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