Yan engine of efficiency n operates between two reservoirs at temperature t, and t, with t,> t, doing an amount of work w in one cvcle. all of this work 1s used

YAn engine of efficiency n operates between twO reservoirs at temperature T, and T, with T,> T, doing an amount of work W in one cvcle. All of this work 1s used to drive an ideal Carnot engine in reverse (as a refrigerator) between the two reservoirs. The total heat extracted from the hot reservoir in one combined cycle of the two engines is Ty- (a) 0 ve (b) W7+