Two trains for Hogwarts leave Narnia at 6 a.m. and 6:45 a.m. and travel at 100…
2019
Two trains for Hogwarts leave Narnia at 6 a.m. and 6:45 a.m. and travel at 100 kmph and 136 kmph respectively. How many kilometers from Narnia will the two trains be together?
- A.
272 km
- B.
260 km
- C.
283.33 km
- D.
262.4 km
Attempted by 11 students.
Show answer & explanation
Correct answer: A
The second train starts 45 minutes later, so the first train has a 75 km head start. The relative speed is 136 - 100 = 36 km/h. Catch-up time after 6:45 a.m. is 75/36 hours, so distance from Narnia is 136 x 75/36 = 283.33 km.