Practicing Success
Two trains cross a pole in 4 sec and 6 sec respectively. Running in same direction in how much time will they take to cross each other if the ratio of their speed is 4 : 9. |
14 sec 16 sec 18 sec 22 sec |
14 sec |
Ratio of train 1 : train 2 Speed 4 : 9 Distance = Speed × Time train 1 takes 4 sec to cross a pole , Length of train 1 = 4 × 4R = 16R train 2 takes 6 sec to cross a pole , Similarly, legth of train 2 = 6× 9R = 54R Total distance = 70R meter As trains moves in same direction . so relative speed = (9 - 4 )R = 5R m/sec Time taken by trains to cross each other = \(\frac{70R}{5R}\) = 14 sec. |