Time and Distance Practice Test 1 with solutions

Question : 21 of 40

Marks: +1, -0

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 time of flight increased by 30 minutes. What is the duration of flight?

4 hours
3 hours
2 hours
1 hour

Validate

Solution:

Let actual speed of the aircraft be x km/hr; then

{600}/{x-200}-{600}/x

1/2

⇒

x^2

- 200x - 24000 = 0
⇒ (x – 600) (x + 400) = 0
∴ x = 600 (Taking positive value only)
Hence, duration of flight =

{600}/{600}

= 1 hr.

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