Problema Solution
Cars can leave a parking lot through two exits. If cars leave only through the first exit, the full parking lot takes 1 hour to empty, and if cars leave through the second exit it takes 1.5 hours to leave. How long would it take the full parking lot to empty if cars left through both exits at the same time?
Answer provided by our tutors
as from 1st exit cars takes 1hour or 60min
thus in 1min =1/60 of the cars exit from 1
from exit 2 cars exit in 1.5 hour=90min
thus in 1min=1/90 cars exit
thus when cars exit from both then in 1min=1/90+1/60=1/36 cars exit
thus total time required for all cars toexit=36 min