A boat travels upstream for 48 miles in 3 hours and returns in 2 hours traveling downstream in a river. What is the rate of the boat in still water and the rate of the current.

20 mph and 4 mph

Step-by-step explanation:

GIVEN: A boat travels upstream for miles in hours and returns in hours traveling downstream in a river.

TO FIND: What is the rate of the boat in still water and the rate of the current.

SOLUTION:

Let the speed of boat in still water be and speed of current be .

speed of water in upstream

  speed of water in downstream

As  

Solving both we get

Hence speed of boat in still water and rate of current is 20mph and 4mph respectively.

for any of you who need the translation here it is

step-by-step explanation:

find the angular size of the equatorial radius of the earth, if the horizontal parallax of the sun