Saved Bookmarks
| 1. |
A train crosses bridge A in 15 seconds and bridge B in 30 seconds. If the length of the train is 200 m and the length of bridge B is twice the length of the train then the length of bridge A? 1. 200 m2. 150 m3. 100 m4. 400 m5. 350 m |
|
Answer» Correct Answer - Option 3 : 100 m Given : Length of train = LT = 200 m Length of bridge B = LB = 400 m Calculations: Let the speed of train = ST And Length of bridge A = LA Formula used : Speed of train = (length of train + length of bridge) /time taken ST = (LT + LA )/15 ----(1) Also , ST = (LT + LB )/30 ----(2) On equating equation (1) and (2) we get ⇒ (LT + LA )/15 = (LT + LB )/30 ⇒ (200 + LA)/15 = (200 + 400)/30 ⇒ LA = 100 m |
|