1.

Train A start from Bhopal to Gwalior while the train B Start from Gwalior to Bhopal. After crossing each other they finish their journey in 36 hours and 81 hours respectively. What will be the speed of train B, if the speed of train A is 27 km/hr?1. 18 km/h2. 20 km/h3. 22 km/h4. 21 km/h5. None of these

Answer» Correct Answer - Option 1 : 18 km/h

Given:

Speed of train A = 27 km/hr

Speed of train B = ?

Time (t1) = 36 hr

Time (t2) = 81 hr

Formula:

Speed of train A/Speed of train B = √t2/t1

Calculation:

Let speed of train B be x km/h

We know that –

Speed of train A/Speed of train B = √t2/t1   …….   (1)

Now,

Put all the given values equation (1) then we get

27/x = √81/36

⇒ 27/x = 9/6

⇒ 9x = 162

⇒ x = 162/9

⇒ x = 18 km/h

The Speed of train B be 18 km/hr



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