Two trains of lengths 120 metres and 180 metres are running in opposite directions on parallel tracks. The speed of the first train is 54 km/hr, and the speed of the second train is 72 km/hr. How much time will it take for the two trains to completely cross each other (rounded off to the nearest integer)?
9 seconds
In opposite directions the relative speed is the sum: 54 + 72 = 126 km/hr.
126 km/hr = \(126\times\frac{5}{18}\) = 35 m/s.
Distance to be covered = sum of lengths = 120 + 180 = 300 m.
Time = \(\frac{300}{35} \approx 8.57\) s, which rounds to 9 s.
Hence, the trains take about 9 seconds to cross each other.
Similar Questions
An express train covers a certain distance at a uniform speed. If its speed was increased by 16 km/h, it would take 8 hours less than the scheduled time. If its speed was decreased by 16 km/h, it would take 12 hours more than the scheduled time. Find the length of the journey.
Two trains are moving in the same direction at 100 km/hr and 60 km/hr, respectively. The faster train crosses a man in the slower train in 9 seconds. What is the length of the faster train?
A train moving at 72 km/h crosses a platform 200 m long in 25 seconds. Find the length of the train.
Two trains start simultaneously from two stations and travel towards each other at speeds of 72 km/hr and 90 km/hr. When they meet, one train has traveled 72 km more than the other. Find the distance (in km) between the two stations.
Important Questions from Problem on Trains
Eight railway stations A, B, C, D, E, F, G and H are connected either by two-way passages or one-way passages. One-way passages are from C to A, E to G, B to F, D to H, G to C, E to C and H to G. Two-way passages are between A and E, G and B, F and D, and E and D.
If the route between G and C is closed, which one of the following stations need not be passed through while travelling from H to C?
A daily train is to be introduced between station A and station B starting from each end at 6 AM and the journey is to be completed in 42 hours. What is the number of trains needed in order to maintain the Shuttle Service?
The length of a train and that of a platform are equal. If with a speed of 108 km/hr the train crosses the platform in one minute. Then the length of the train (in metres) is:
A train can cross a pole and a bridge 75 meters long in 10 seconds and 25 seconds respectively. Find the length of the train.
A 275 metre long train crosses a platform of equal length in 33 seconds. What is the speed of the train in kmph?
