Alvin paddled for 3 hours with a 4-Km/h current to reach a campsite. The return trip against the same current took 7 hours. find the speed of the boat in still water. The speed of the boat in still water was Km/h?

Alvin's average paddling 3km/h .The speed of the boat in still water was Km/h is given below

Step-by-step explanation:

Let the boat speed in still water be x km/hr.

We know the current is 3 km/h so:

4(x+3) =  7(x-3)

4x + 12 = 7x - 21

-3x  = -33

x = 11 km/h

Therefore the speed of the boat in still water is 11 km/h

the figures below are made out of circles, semicircles, quarter … find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations). remember that we'll also have to cut whatever areas we get in half, since we're only dealing

step-by-step explanation:

your answer would be 12