the road connecting two towns a and b goes only uphill or downhill i.e. there is no stretch of road that is level. vijay's car does a constant 40 kmph uphill and 80 kmph downhill. find the distance between a and b if it takes exactly nine hours for vijay to make one round trip from a to b and back.
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Ans. is 240 Km ... solution is in the pic :)
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D1+D2=d
D1/40+D2/80+D1/80+D2/40=9
(D1+D2)(1/40+1/80)=9
D *120/(40*80)=9
D =9*80/3=240
D1/40+D2/80+D1/80+D2/40=9
(D1+D2)(1/40+1/80)=9
D *120/(40*80)=9
D =9*80/3=240
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