Total Work = Efficiency × Time Calculation: Assume: B completes the work in x days. A does half the work in 3∕4 of the time ⇒ A does full work in (3∕4)×2=3x∕2 days. Work done by A in one day =1∕(3x∕2)=2∕3x Work done by B in one day =1∕x Together, work done in one day =1∕66 ⇒(2∕3x)+(1∕x)=1∕66 ⇒(2+3)∕3x=1∕66 ⇒5∕3x=1∕66 ⇒3x=5×66=330 ⇒x=330∕3=110