Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

1.	Navjivan Express from Ahmedabad to Chennai leaves Ahmedabad at 6:30 am and travels at 50kmph towards Baroda situated 100 km away. At 7.00 am Howrah-Ahmedabad Express leaves Baroda towards Ahmedabad and travels at 40 kmph. At 7:30 am Mr. Shah, the traffic controller at Baroda realizes that both trains are running on the same track. How much time does he have to avert a head-on collision between the two trains?1. 15 min2. 20 min3. 25 min4. 30 min
Answer» Correct Answer - Option 1 : 15 min Given: Navjivan Express from Ahmedabad to Chennai leaves Ahmedabad at 6:30 am and travels at 50km/h towards Baroda At 7.00 am Howrah-Ahmedabad Express leaves Baroda towards Ahmedabad and travels at 40 km/h At 7:30 am Mr. Shah, the traffic controller at Baroda realizes that both trains are running on the same track The distance between Ahmedabad to Baroda is 100 km. Concept: Time = Distance/Speed Calculation: At 7.30 AM, Distance travel by Navijan express is ⇒ 50× 1 ⇒ 50 km At 7.30 AM, Distance travel by Howrah-Ahmedabad Express is ⇒ 40× 1/2 ⇒ 20 km Now, Distance left between the both train is ⇒ 100 - 50 - 20 ⇒ 30 km Both train travel in opposite direction, then relative speed of the trains is ⇒ 50 + 40 ⇒ 90 km/h Time taken to cover this distance by both train is ⇒ 30/90 ⇒ 1/3 hour = 20 min So, He have to time less than 20 min to avert the head on collision between two trains. ∴ 15 min

Navjivan Express from Ahmedabad to Chennai leaves Ahmedabad at 6:30 am and travels at 50kmph towards Baroda situated 100 km away. At 7.00 am Howrah-Ahmedabad Express leaves Baroda towards Ahmedabad and travels at 40 kmph. At 7:30 am Mr. Shah, the traffic controller at Baroda realizes that both trains are running on the same track. How much time does he have to avert a head-on collision between the two trains?1. 15 min2. 20 min3. 25 min4. 30 min

Answer» Correct Answer - Option 1 : 15 min

Given:

Navjivan Express from Ahmedabad to Chennai leaves Ahmedabad at 6:30 am and travels at 50km/h towards Baroda

At 7.00 am Howrah-Ahmedabad Express leaves Baroda towards Ahmedabad and travels at 40 km/h

At 7:30 am Mr. Shah, the traffic controller at Baroda realizes that both trains are running on the same track

The distance between Ahmedabad to Baroda is 100 km.

Concept:

Time = Distance/Speed

Calculation:

At 7.30 AM, Distance travel by Navijan express is

⇒ 50× 1

⇒ 50 km

At 7.30 AM, Distance travel by Howrah-Ahmedabad Express is

⇒ 40× 1/2

⇒ 20 km

Now, Distance left between the both train is

⇒ 100 - 50 - 20

⇒ 30 km

Both train travel in opposite direction, then relative speed of the trains is

⇒ 50 + 40

⇒ 90 km/h

Time taken to cover this distance by both train is

⇒ 30/90

⇒ 1/3 hour = 20 min

So, He have to time less than 20 min to avert the head on collision between two trains.

∴ 15 min

Discussion