Q. What is the time required by a 110 m long train to cross a tunnel 220 m
long at rate of 22 m/s
Ans. The formula for this is as below.
Time = Distance = 220+110 = 15 s
Speed 22
Q. A train running at the speed of 60 Km/hr crosses a pole in 9 sec.
What is the length of the train in meters.
Ans. The formula for this is as below.
Length of the train = Speed X Time = 60 X 9 X 5 = 150 m
18
Km = 1000 = 5 meter
Hr 3600 18 Sec
Q. How many seconds will a train , 60 m in length, travelling at the rate of 42 Km an hour take to pass another train 84 m long proceeding in the same direction at the rate of 30 Km an hour.
Ans. Time = Total Length = (60 + 84) X 18 = 43.2 sec
Relative Speed (42-30) X 5
Q. Two Trains are running at 40 Km/hr and 20 Km/hr respectively in the same direction. Fast train completely passes a man sitting in the slower train in 5 sec.
What is the length of fast train.
Ans. Length of the fast train = Relative Speed X Time
= (40-20) X 5 X 5 = 22 7 m
18 9
Km = 1000 = 5 meter
Hr 3600 18 Sec
Q. A train 50 m long passes a platform 100 m long in 10 sec.
Find the speed of the train in Km/hr.
Ans.
Speed = Distance = 50+100 = 15 m/s X 18 = 54 Km/hr
Time 10 5
Q. A 180 m long train crosses a man standing on the platform in 6 sec.
What is the speed of the train.
Ans.
Speed = Distance = 180 X 18 = 108 Km/hr
Time 6 5
Q. Two trains whose lengths are 180 m and 220 m respectively are running in direction opposite to one another with respective speeds of 40 Km/hr and 50 Km/hr.
Find the time taken by them to cross each other.
Ans.
Time taken = Total Length = 220+180 X 18 = 16 s
Relative Speed 50+40 5
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