Answer:
9
Step-by-step explanation:
The time required by the ambulance is ...
time = distance/speed
time = (20 mi)/(40 mi/h) = 1/2 h = 30 minutes
The time required by the helicopter is ...
trip time = takeoff time + route time + landing time
= (3 min) + (15 mi)/(1 mi/min) +(3 min) = (3 + 15 + 3) min = 21 min
The difference in times is ...
(30 min) -(21 min) = 9 min
The helicopter takes 9 fewer minutes for the trip.
