with an average speed of 40 km/h, a train reaches its destination in time. if it goes with an average speed of 35 km/h, it is late by 15 minutes. the length of the total journey is
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ratio of time taken = 40:35 = 8:7
time difference = 15 mins
8-7=1
1=15
thus ,
8=8×15=120mins
with 2nd speed ,
35×2=70km
time difference = 15 mins
8-7=1
1=15
thus ,
8=8×15=120mins
with 2nd speed ,
35×2=70km
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