Two trains are on the same track a distance 300 km apart heading towards one another, One at a speed of 150 km/h and other at a speed of 50 km/h. A fly starting out at the front of one train, flies towards the other at a speed of 600 km/h. Upon reaching the other train, the fly turns around and continues towards the first train. How many kilometers does the fly travel before getting squashed in the collision of the two trains?
2007-02-22 13:17:58 · 2 answers · asked by Jeera 1 in Science & Mathematics ➔ Astronomy & Space
How long does the fly fly? If the trains are 300 km apart and they are coming at each other at a combined speed of 200 kph, then when the trains, locomotives, engineers, and fly get squashed into a mess, 300/200 or 1.5 hours will have passed.
How fast did the fly go? It goes 600 kph. So in 1.5 hours, it will have gone 1.5*600 or 900 kilometers.
You can also solve this by computing how far the fly goes on each leg. The result is a geometric series which can be summed. But this way of solving it is a lot more efficient.
2007-02-22 13:37:27 · answer #1 · answered by alnitaka 4 · 0⤊ 0⤋
wow can a fly really fly at 600km/h?
2007-02-22 13:28:41 · answer #2 · answered by tonyma90 4 · 0⤊ 0⤋