There is a stream which flows for 15 km. I have a boat with speed 14 km/hr and a stream with speed x km/hr. Write an expression for the time it takes to travel upstream and downstream respectively.

14/(15-x), 14/(15+x)

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15/(14+x), 15/(14-x)

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15/(14-x), 15/(14+x)

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14/(15+x), 14/(15-x)

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Solution

The correct option is C
15/(14-x), 15/(14+x)

Time = $\frac{d i s t a n c e}{s p e e d}$

Distance = 15 km

Upstream speed = 14-x(Stream flows against boat)

Downstream speed = 14 + x(Stream flows with boat)

Upstream time = $\frac{D i s t a n c e}{u p s t r e a m s p e e d}$

= $\frac{15}{14 - x}$

Downstream time = $\frac{D i s t a n c e}{d o w n s t r e a m s p e e d}$

= $\frac{15}{14 + x}$

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There is a stream which flows for 15 km. I have a boat with speed 14 $\frac{k m}{h r}$ and a stream with speed x $\frac{k m}{h r}$ . In how much time can I travel upstream and downstream respectively?Write an expression for that.

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There is a stream which flows for 15 km. I have a boat with speed 14 km/hr and a stream with speed x km/hr. Write an expression for the time it takes to travel upstream and downstream respectively.

The correct option is C 15/(14-x), 15/(14+x) Time = distancespeed Distance = 15 km Upstream speed = 14-x(Stream flows against boat) Downstream speed = 14 + x(Stream flows with boat) Upstream time = Distanceupstreamspeed = 1514−x Downstream time = Distancedownstreamspeed = 1514+x