Question

If sandy can decorate a cake in 3 hr and eric can decorate the same cake in 5 hr what is their hourly rate working together

Answer 1

we are given

sandy can decorate a cake in 3 hr

so,

In 1 hour , sandy can decorate

$=\frac{1}{3}$ part of cake

Eric can decorate the same cake in 5 hr

so,

In 1 hour , sandy can decorate

$=\frac{1}{5}$ part of cake

so, when they work together

In 1 hour , Sandy and Eric decorate

$=\frac{1}{3} +\frac{1}{5}$

$=\frac{5}{15} +\frac{3}{15}$

$=\frac{8}{15}$

so, their hourly rate is

$=\frac{8}{15}$.............Answer