A car moves at a speed of 54 km/hr after repairing and at a speed of 36 km/hr…
2021
A car moves at a speed of 54 km/hr after repairing and at a speed of 36 km/hr before repairing. It covers a distance of x km in 6 hours after repairing. How much time will it take to cover a distance of 3x km before repairing?
- A.
27 hours
- B.
32 hours
- C.
24 hours
- D.
30 hours
Attempted by 166 students.
Show answer & explanation
Correct answer: A
Solution: Find x from the after-repair information and then compute the required time before repair.
Step 1: Calculate x. After repair speed = 54 km/h and time = 6 h, so x = 54 × 6 = 324 km.
Step 2: Distance to cover before repair = 3x = 3 × 324 = 972 km.
Step 3: Time at before-repair speed = distance ÷ speed = 972 ÷ 36 = 27 hours.
Final answer: 27 hours.