Question

A swimming pool whos surface forms a rectangle measures 25 m long by 15 m wide The pool is 2 m deep at the shallow end and the depth increases at a constant rate to 4 m deep at the other end How many?

Answer 1

How many .... what ???

I assume you are asking for the rate of increase of the depth.

for the of length 25 m, the depth increases by 2 m

so the depth increases 1 m per 12.5 m of length

notice the width has nothing to do with it.