Amotorboat takes 40 minutes to travel 20 miles downstream. the return trip takes 60 minutes. what is the speed of the current?

The current is 5 mph

Step-by-step explanation:

The current helps the boat going down stream and hinders going up so it adds to the speed downstream and subtracts going up.

speed downstream is 20miles/40minutes =1 mi per 2 min. Or 30 mph

Speed upstream is  

20 miles/ 60 minutes = 1 mile per 3minutes or 20 mph

So if the speed of the boat is the same (s) then downstream the boat travels  

S+c =30 mph and s-c =20mph upstream if c is tge current speed

So s=30-c and s=20+c  

So. 30-C=20+c

      10=2C

       5=C

The current is 5 mph

answer 1 : option "c"

answer 2 : option "d"

answer 3 : option "b"

answer 4 : option "d"

answer 5 : option "b"

answer 6 : option "a"

answer 7 : option "c"

answer 8 : option "d"

answer 9 : option "c"

answer 10 : option "d"

answer 11 : option "c"

answer 12 option "b"

answer 13 option "c"

answer 14 option "c"

answer 15 option "d"

answer 16 option "a"

answer 17 option "b"

answer 18 option "c"

answer 19 option "a"

answer 20 option "a"

answer 21 option "c"

d