Attempt this Question based on Time, Speed and Distance to check your Preparation

Question of The Day26-08-2021

Train A started from Kanpur station and at the same time train B started from Agra station toward each other. After crossing each other they take 4 hours and 36 hours respectively to reach the destination (i.e. Start point of other train). If the speed of train A is 180 km/h, then find the speed of train B.

Answer

Correct Answer : b ) 60 km/h

Explanation :

According to the question

We know that,

\({s1 \over s2}=\sqrt{T_2 \over T_1}\)

Where, s₁ = speed of train A and s₂ = Speed of train B and T₁ be the time taken by train A after crossing and T₂ be the time taken by the train B after crossing.

T₁= 4hrs and T₂ = 36hrs

\(s1 \over s2\)=\(\sqrt{36 \over 4}\) ⇒\(\sqrt 9\)

\(s_1\over s_2\)=\(3 \over 1\)

Speed of train A = 180km/h

3unit = 180 km/h

1 unit = 60 km/h

Speed of train B = 60km/h

Hence, (b) is the correct answer.