Answer:
9 hours
Explanation:
The two planes fly thew same distance. Let d = distance.
The first plane flies at speed s₁=495 mph for t₁=7 hours.
The second plane flies at speed s₂=385 mph for t₂=9 hours.
Plane 1:
distance = d
speed = s₁ = 495 mph
time = t₁ = 7 hours
speed = distance/time
distance = speed × time
d = s₁ × t₁
d = 495 mph × 7 hours
d = 3465 miles
The distance is equal for both planes.
The speed and time and different for both planes.
Plane 2:
distance = d = 3465 miles
speed = s₂ = 385 mph
time = t₂ = ?
d = s₂ × t₂
s₂ × t₂ = d
t₂ = d/s₂
t₂ = 3465/385
t₂ = 9
Answer: 9 hours