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

`=(1)/(3)` part of cake

Eric can decorate the same cake in 5 hr

so,

In 1 hour , sandy can decorate

`=(1)/(5)` part of cake

so, when they work together

In 1 hour , Sandy and Eric decorate

`=(1)/(3) +(1)/(5)`

`=(5)/(15) +(3)/(15)`

`=(8)/(15)`

so, their hourly rate is

`=(8)/(15)`.............Answer