A man covers 13rd of his journey by cycle at 50 kmph, the next 13rd by car at 30 kmph and the rest by walking at 7 kmph. find his average speed during the whole journey.
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Average Speed = Total Distance / Total Time
let total distance = x km
x/3 cover @ 50kmph
T1 = x/150 hr
x/3 cover @30kmph
T2 =x/90 hr
x/3 cover @7kmph
T3 = x/21 hr
Total Time (T) =T1+T2+T3 = x/150+x/90 +x/21 = 206x/3150 hr
Average Speed = x/(206x/3150) = 3150x/206x = 15.29kmph
let total distance = x km
x/3 cover @ 50kmph
T1 = x/150 hr
x/3 cover @30kmph
T2 =x/90 hr
x/3 cover @7kmph
T3 = x/21 hr
Total Time (T) =T1+T2+T3 = x/150+x/90 +x/21 = 206x/3150 hr
Average Speed = x/(206x/3150) = 3150x/206x = 15.29kmph
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