Niles and Bob sailed at the same time for the same length of time. Niles' sailboat traveled 15 miles at a speed of 5 mph, while Bob's motorboat traveled 42 miles at a speed of 14 mph. For how long were Niles and Bob traveling?

7 MPH

Explanation:

the speed of the river is c=mph

The effective downstream speed = 14 + c

The effective upstream speed = 14 - c

Total time = 4 hrs

Total distance = 42 miles

Time for upstream + time for downstream = 4 hrs

21 / (14 + c) + 21 / (14 - c) = 4

21 (14 - c + 14 + c) = 4 (196 - c^2)

21 x 28 = 4 (196 - c^2)

c^2 = 196 -147 = 49

C=7 mph hope this helps

it's no easy i swear it's hard

according to the quotation from booker t. washington's 1895 atlanta compromise speech.

in the great leap from slavery to freedom . . the masses of us are to live by the production of our hands . . we shall prosper . . as we learn to dignify and glorify common labor.

washington believed that  hard work had its own kind of dignity.

explanation:

mark brainliest and have a great day!