Asteamer going downstream traveled the distance between two ports in 3 hours. the return trip took 3 hours and 40 minutes. find the speed of the water current if the speed of the steamer in still water is 18 mph?

1.8 mph

Step-by-step explanation:

first, let's convert 3 hour 40 minutes into hours (to keep same units).

40 minutes is 40/60 = 2/3 hour

So 3 hr 40 minutes  = hours

Now, we know D = RT

where D is distance, R is rate, and T is time

Let rate of steamer be x (which is 18)

and rate of current be c

Rate Downstream = x + c (goes with current)

Rate Upstream = x - c (goes against current)

Both Distance (upstream & downstream) are same. Thus, we can write:

Now, we solve this algebraically for "c", speed of current:

Thus, speed of current = 1.8 mph

341

step-by-step explanation:

all you have to do is 9x31 (which equals 279) and then 20x31 (which equals 620). then you have to subtract. 620-279=341.