Upstream speed of a boat is 12 km/hr which is 75% of the speed of boat in still water. Find
how much distance boat will cover

2 thoughts on “Upstream speed of a boat is 12 km/hr which is 75% of the speed of boat in still water. Find<br />how much distance boat will cover”

1. Answer:

   120 km

   Step-by-step explanation:

   let speed of boat in still water be x then

   ATQ in upstream speed of boat is 75% of speed of boat In still water i.e

   x (75) /100 = 12

   3x/4 = 12

   x = 4 *4 = 16km/hr

   now speed of water = decrease in speed of boat i.e 25 % of x

   then speed of water = 16 * 25/100. = 4km/hr

   now total spees in downstream

   = speed of boat + speed of water

   = 16 + 4 = 20km/hr

   now, distance = speed*time

   = 20 * 6 = 120km

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2. Answer:

   So distance covered downstream in 6 hrs=120 km

   Step-by-step explanation:

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

   and speed of water =y

   Upstream speed=x-y

   Given x-y=0.75x=12————–(1)

   x=12/0.75=16 km/hr

   So the speed of boat in still water=16 km

   from(1)

   16-y=12

   y=16-12=4 km/hr

   Hence

   Speed in down stream=(x+y)=16+4=20 km/hr

   So distance covered in 6 hrs=20*6=120 km

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