A boat goes 25km downstream in 2.5 hours and 12km upstream in 3 hours. find the speed of the boat in still water and speed of the stream.
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Step-by-step explanation:
speed of stream equals to X kilometre per hour
speed of boat equals to Y kilometre per hour
according to question
a boat goes 25 km downstream in 2.5 hours
using the formula speed equals to distance upon time
y=25+x/2.5. (1)
12 km upstream in 3 hours
y=12-x/3. (2)
put the value of Y on equation 2
then you will get the value of x
and then put the value of x on equation 1 or equation 2 to get the value of Y
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Answer:
speed of boat in still water is 7 km/hr and speed of stream is 3 km/hr
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