Here we will learn about the concept of two trains passes in the same direction.

When two train passes a moving object (having some length) in the same direction.

Let length of faster train be l meters and length of slower train be m meters

Speed of faster train be x km/hr and speed of slower train be y km/hr

Relative speed = (x – y) km/hr

Then, time taken by the faster train to pass the slower train = (l + m) meters/(x – y) km/hr

**Note:** Change km/hr to m/sec

Now we will learn to calculate when two trains running on parallel tracks (having some length) in the same direction.

Solved examples when two trains passes (having some length) in the same direction:

**1.** Two trains 130
m and 140 m long are running on parallel tracks in the same direction with a speed
of 68 km/hr and 50 km/hr. How long will it take to clear off each other from
the moment they meet?

**Solution: **

Relative speed of trains = (68 – 50) km/hr

= 18 km/hr

= 18 × 5/18 m/sec

= 5 m/sec

Time taken by the train to clear off each other = sum of length of trains/relative speed of trains

= (130 + 140)/5 sec

= 270/5 sec

= 54 sec

**2.** The two trains
are running on parallel tracks in the same direction at 70 km/hr and 50 km/hr
respectively. The faster train passes a man 27 second faster than the slower
train. Find the length of the faster train.

**Solution: **

Relative speed of the trains = (70 – 50) km/hr

= 20 km/hr

= 20 × 5/18 m/sec

= 50/9 m/sec

Length of the faster train = relative speed × time taken by train to pass

= 50/9 × 27 m

` = 150 m

Relationship between Speed, Distance and Time

Problems on Calculating Distance

Two Objects Move in Same Direction

Two Objects Move in Opposite Direction

Train Passes a Moving Object in the Same Direction

Train Passes a Moving Object in the Opposite Direction

Two Trains Passes in the Same Direction

Two Trains Passes in the Opposite Direction

**8th Grade Math Practice**

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