Saved Bookmarks
| 1. |
A man standing on a bridge 300 meters long observes that a train takes 13 1/2 seconds to pass the bridge and 9 second to pass him.Find the lenght and the speed of the train |
|
Answer» Answer: 600 m, 66.67 m/s Explanation: Distance covered by train to cross the man = LENGTH of train = L Distance = SPEED × Time L = V × 9 V = L/9 ...(1) Distance covered by train to completely pass the BRIDGE = L + 300 m Distance = Speed × Time L + 300 = V × 13½ L + 300 = V × 27/2 From equation (1) L + 300 = L/9 × 27/2 L + 300 = 3L/2 L - 3L/2 = -300 -L/2 = -300 L = 600 m Speed of train from equation (1) is V = L/9 = 600 / 9 = 66.67 m/s |
|