Question

The ratio of upstream and downstream in still water is 3:4, the speed of still water is 12.5km/hr. What is the distance

Answer 1

Answer:

The ratio of upstream: downstream speed is given as 3:4

So, let the upstream speed be 3x and downstream speed be 4x

Now to find the speed of still water = 1/2( downstream speed- upstream speed)

So, 1/2( 4x-3x) = 12.5

Or, 1/2 x = 12.5

Or, x= 12.5*2 = 25

So, the downstream speed= 100km/hour and upstream speed= 75km/hour

Also, the speed of the person/boat can be determined as 1/2( 175) = 87.5 km/hour.

However, the upstream or downstream distance cannot be determined from this information and requires more data( time needs to be given).