B walks at a speed of 9 km/hr and 9 hours after his start, C starts on his…
2021
B walks at a speed of 9 km/hr and 9 hours after his start, C starts on his cycle after him at the speed of 18 km/hr. How far from the starting point will C catch B?
- A.
144 km
- B.
162 km
- C.
198 km
- D.
236 km
Attempted by 11 students.
Show answer & explanation
Correct answer: B
B walks for 9 hours at 9 km/hr, so B gets a head start of 81 km.
C cycles at 18 km/hr while B continues at 9 km/hr, so the relative speed is 9 km/hr.
Time to catch = 81 / 9 = 9 hours after C starts. Distance from start = 18 x 9 = 162 km.