speed of a boat along the stream is 7 km/ hr while against the strem is 5 km/ hr . if the time taken bt the boat to go from one place to another place and back in 30 minutes what is distance between two place
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Answered by
1
Answer:
Speed of downstream = 35 / 7 = 5km / hr. ∴ Speed of man in still water = (4 + 5) / 2 = 4.5 km / hr. 12 km upstream in 48 min.
Answered by
1
Answer:
let the distance be x km
speed downstream = 7 kmph
time taken = x/7 hour = 60x/7 minutes
speed upstream = 5 kmph
time taken = x/5 hour = 60x/5 minutes
total time taken = 60x/7 + 60x/5
= 60*12x/35
= 144x /7
given
total time taken = 30 minutes
144x/7 = 30
x = 30*7/144
x= 210/144 km
= 35/24 km
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