Q1:
In a flight of 600 km, an aircraft was slowed down due to bad weather. Its average speed for the trip was reduced by 200 km/hr and the time of flight increased by 30 minutes. The duration of the flight is:
A 1 hour
B 2 hour
C 3 hour
D 4 hour
ANS:A - 1 hour
Let the duration of the flight be x hours.
Then,
600
-
600
= 200
x
x + (1/2)
600
-
1200
= 200
x
2x + 1
x(2x + 1) = 3
2x2 + x - 3 = 0
(2x + 3)(x - 1) = 0
x = 1 hr. [neglecting the -ve value of x]
