Train Speed | MCQs

Explanation

Given:

• Length of each train = 150 m

• Total length to cross = 150 m + 150 m = 300 m

• Time taken to cross = 15 seconds

• Trains are moving in opposite directions at the same speed

 Step 1: Use the formula

Relative speed= Total distance/Time ​= 300 / 15​ = 20 m/s

Since both trains have the same speed and are moving in opposite directions:

Relative speed=v+v=2v=20 m/s⇒v=20​/2=10 m/s

Step 2: Convert to km/h

$$1 text{m/s} = 3.6 text{km/h} Rightarrow 10 text{m/s} = 10 times 3.6 = 36 text{km/h}$$

Explanation

China launched the CR450, the fastest high-speed train, reaching 450 km/h in tests and 400 km/h commercially.

It improves on the CR400 Fuxing, featuring advanced technology for speed, energy efficiency, and passenger comfort.

The train supports China’s goal to expand its rail network to 70,000 km by 2035.

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Explanation

Speed = Distance / Time = 240 miles / 24 minutes = 10 miles per minute

Now, we need to find the time required to cover 650 miles:

Time = Distance / Speed = 650 miles / 10 miles per minute = 65 minutes

So, the correct answer is: 65 minutes

Explanation

When the trains move in opposite directions, their relative speed is the sum of their individual speeds:

60 km/h + 40 km/h = 100 km/h

To convert this to meters per second, divide by 3600 (since there are 3600 seconds in an hour):

100 km/h ÷ 3600 = 27.78 m/s (approximately)

The total distance covered by the trains as they cross each other is the sum of their lengths:

140 m + 160 m = 300 m

Time = Distance ÷ Relative Speed

Time = 300 m ÷ 27.78 m/s ≈ 10.8 s

Explanation

To find the duration of the train journey, subtract the start time from the arrival time:

Arrival time: 5:23 p.m.

Start time: 9:32 a.m.

Convert both times to a 24-hour clock:

Arrival time: 17:23 (5:23 p.m.)

Start time: 09:32 (9:32 a.m.)

Subtract the start time from the arrival time:

17:23 - 09:32 = 7 hours 51 minutes

Therefore, the train journey took 7 hours and 51 minutes.

Explanation

Explanation

Two trains each of length 150m are running in opposite directions at the same speed,

If they cross each other in 15 seconds,

36 is the speed of each train in Km per hour

Explanation

Explanation

Length of the train = 240 m

Time taken to pass the pole = 24 seconds

Speed of the train = Distance / Time = 240 m / 24 s = 10 m/s

Total distance to be covered = Length of train + Length of platform = 240 m + 650 m = 890 m

Time taken to pass the platform = Total distance / Speed = 890 m / 10 m/s = 89 seconds

Explanation

To solve this problem, we need to convert the speed from km/hr to m/s and then use the formula:

Time = Distance / Speed

First, let's convert the speed:

63 km/hr = 63 x (1000 m / 3600 s) = 17.5 m/s

Now, let's calculate the time:

Time = Distance / Speed

= 250 m / 17.5 m/s

= 14.3 seconds