Question 79

A plane left 30 minutes later than the scheduled time and in order to reach the destination 1500 km away in time, it had to increase the speed by 250 km/hr from the usual speed. Its usual speed is:

Solution

Share

The plane left half an hour late i.e it had to cover the same distance in half hour less time.
Now, we know that time = distance/speed
Let the origibal speed of the plane be x.
Now, (1500/x - 1500/x+250) = 0.5
Solving we get x = 750 km/hr.
Hence, the correct answer is option D.
 

Get AI Help

View More Questions From Speed Time Distance Work

Create a FREE account and get:

  • Download Maths Shortcuts PDF
  • 300+ previous papers with solutions PDF
  • 500+ Online Tests for Free

Book Free CAT Mentorship

Get personalized CAT strategy from a 99%iler

500+ students mentored
CAT mentor

Join CAT 2026 course by 5-Time CAT 100%iler

Start your IIM journey with the right preparation and crack CAT 2026.

Enroll Now
Ask AI