Atourist sailed against the current on a river for 6 km, and then he sailed in a lake for 15 km. in the lake he sailed for 1 hour longer than he sailed in the river. knowing that the current of the river is 2 km/hour, find the speed of the boat while it is traveling in the lake.

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?

Apyramid fits exactly inside a cube. the cube and the pyramid share the same square base, and they are both exactly the same height. the volume of the cube is 66 cubic inches. what is the volume of the pyramid? explain your answer. answer asap

4. a single woman uses an online cash flow calculator which reveals a cash flow of 203. what does this mean?