Multiple choice

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:

  1. $1$ Hour
  2. $3$ Hours
  3. $2$ Hours
  4. $4$ Hours
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let original speed be v. d/v - d/(v-200) = 0.5. 600/v - 600/(v-200) = 0.5. Solving this quadratic equation for v gives v = 600. Time = 600/600 = 1 hour.

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