A 25 storeyed building has 5 lifts. The resulting waiting

A 25 storeyed building has 5 lifts. The resulting waiting time is 35 sec and ‘Return Travel Time’ is 175 sec. The number of lifts required for reducing waiting time to 25 sec, without increasing the lift speed, is _______________

7.0 to 7.0
Resulting waiting time (T) =

Return travel time		RT		of Lits.
		No.

Here, Expected Resulting wating time (T) = 25 sec.
Return travel time (RT) = 175 Sec.

Thus, No. of Lits required =	RT	=	175	= 7
	T		25