A car covered 150 km in 5 hours. If it travels at one-third its usual speed, then how much more time will it take to cover the same distance?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e 10 hours
⇒ The distance covered = 150 km
⇒ The time is taken = 5 hours
⇒ Speed = 150 / 5 = 30 kmph
The speed has become one-third so the speed will be (1 / 3) × 30 = 10 kmph
⇒ The new taken at new speed = 150 / 10 = 15 hours
The amount of extra time taken = 15 - 5 = 10 hours