Problema Solution
The speedOf a boat in still water is 15km/hr.It goes 30 km upstream and downstream to the original point in 4hrs 30minutes.Find the speed of the stream.
Answer provided by our tutors
Let the speed of the stream be x km/hr.
Speed of the boat down stream = (15+x) km/hr (1/2 mark)
And, speed of the boat upstream = (15-x) km/hr (1/2 mark)
Time taken by the boat to go 15 km downstream = hrs. (1/2 mark)
Time taken by the boat to go 15 km upstream = (1/2 mark)
Since total time taken by the boat in downstream and upstream is 4 hours 30 minutes ie . .
(1 mark)
(1 mark)
(1/2 mark)
But speed cannot be negative Hence, the speed of the stream = 5km/hr