Question

Warren can shovel a driveway in 4hrs, but if his sister kori helps it would take 2.5 hours. How long would it take kori to shovel the driveway alone ?

? Hours

Answer 1

6.67 hours

Kori would take 6 hours and 40 minutes

Explanation:

`(1)/(2.5) =(1)/(4) +(1)/(k)`

`(1)/(k) =(1)/(2.5) -(1)/(4)`

`(1)/(k) =(4-2.5)/((4)(2.5)) =(1.5)/(10)`

`(1)/(k) =0.15`

`k=(1)/(0.15)`

`k=6.67`

about 6h 40 min

Hope this helps