2022 · Q16
There are two stations X and Y, 1320 km apart. A train starts from station X at 6 a.m. and moves at an average speed of 60 km/hr. At 2 p.m. another train starts from Y towards X and moves at an average speed of 80 km/hr. When do they meet?
Elementary MathematicsTime, Speed and Distance
- A6 p.m.
- B7 p.m.
- C8 p.m.
- D9 p.m.
Explanation
By 2 p.m. the first train has covered 8×60 = 480 km, leaving 840 km. The closing speed is 60+80 = 140 km/h, so they meet 840/140 = 6 hours after 2 p.m., i.e. at 8 p.m. The keyed option is C.