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A man travels from A to B at 70 mph over a certain journey and returns over the same route to A, at 80 mph. What is his average speed for the journey?
a) 74.66 b)75 c)74.33 d)74.99 7.
Read Solution (Total 3)
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- it is solve 2*x*y/x+y
2*70*80/150=74.66
- 13 years agoHelpfull: Yes(8) No(0)
- avg speeed= total distance/total time
total distance=d+d=2d
total time=d/70+d/80=d(1/70+1/80)
solving
we 2*70*80/(70+80)=74.66 - 13 years agoHelpfull: Yes(4) No(0)
- formula 2*x*y/(x+y)
so,here
avg. speed=2*70*80/(70+80)=74.66.
a) is correct. - 13 years agoHelpfull: Yes(2) No(0)
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