If man goes from a to b 40kmph and return 50 kmph what is average spead
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Let distance = x km
Time ( a to b) = x/40 h
Time ( b to a ) = x/50 h
Total time = x/40 + x/50 = 9x/200 h
Total distance = 2x Km
Average speed = 2x/(9x/200) = 400/9 km/h
TRICK
average speed = 2ab/a + b
= 2 x 40 x 50 / ( 40 + 50 )
= 2 x 40 x 50 / 90
= 400/9 km/h
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Answered by
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let distance traveled = x
total time taken = x/40+x/50
avg. speed = total dis./totaltime
2x/x/40+x/50
2x/90x/200
200/45
4whole1/4
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