Question

A does 20% less work than b. If a can complete a piece of work in 7 1/2 hrs, then b can do it in

Answer 1

let the time by B = x

$\frac{efficiency}{} \infty \frac{1}{time \: taken}$

if B is 100% efficient

A is 80% efficient

$\frac{80}{100} = \frac{x}{ \frac{15}{2} }$

x = 6 hrs