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If man goes from a to b 40kmph and return 50 kmph what is average spead |
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Answer» 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 hope it HELP u plz mark as a brainliest & follow me |
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