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3 years ago

PLEASE HELP FAST!!!!

Mathematics

1 answer:

DochEvi [55]3 years ago

6 0

Answer:

Time = 25/9 hr

Step-by-step explanation:

Let speed of boat in still water is x km/hr

then, speed in downstream equals to "x + 3"km/hr

and speed in upstream equals to "x - 3" km/hr

We also know that time taken to travel 3km in upstream is twice as time taken to travel 4km in downstream.

so, using time = distance/speed

3/x- 3 = 2 × (4/x + 3)

3x + 9 = 8x -24

5x = 33

x = 33/5 km/hr

Net speed in upstream = 33/5 - 3 = 18/5 km/hr

So, Time taken to travel 10km upstream = distance /speed

= (10 × 5) / 18 = 25/9 hr

Time = 25/9 hr

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