A person has to cover a distance of 8 km in 1 hour. If he covers one-fourth of the distance in one-third of the total time, then what should his speed (in km/h) be to cover the remaining distance in the remaining time so that the person reaches the destination exactly on time?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e 9.
The person covers 2 km (one-fourth of 8 km) in 20 minutes (one-third of 60 minutes).
Now, 6 km remains to be covered in 40 minutes.
To cover 6 km in 40 minutes, the required speed is:
6 km / (40/60) hours = 6 km / (2/3) hours = 6 * 3/2 = 9 km/h.
So, the speed should be 9 km/h.