Dr. Lal And Jain Solutions for Exercise 2: EXERCISE

A train running with a uniform speed crosses a platform in $20$ seconds. To determine the speed of the train, the knowledge of which of the statements (a) and (b) is/are sufficient?
(a) Length of the train.
(b) Length of the platform.

A train is running at the speed of $84 \mathrm{km}/\mathrm{hr}$. If it passes a man walking in opposite direction at the speed of $6 \mathrm{km}/\mathrm{hr}$ in $4$ seconds, what is the length of the train in $\mathrm{m}$?

If a $100 m$ long train which is moving at $50 km/hr$, crosses another train which is $120 m$ long and moving in opposite direction in$6$ seconds, what is the speed of the second train?

A train running at a speed of $120 km/hr$ crosses another train running in opposite direction in $9$ seconds. To find out the length of the first train, the knowledge of which of the statements (P) and (Q) is/are sufficient?
(P) Speed of the second train.
(Q) Length of the second train.

A boat travels from P to Q along the current and from Q to P against the current in$3 hours$. If the speed of the boat in still water is $4 km/hr$then, what is the distance between P and Q?

A train running at $90 \mathrm{km}/\mathrm{hr}$ crosses a pole in $10$ seconds. What is the length of the train?

Train A crosses another train B running in the opposite direction in$9 \mathrm{seconds}$. What is the speed of train A? To know the answer to this question, the knowledge of which of the following statement is/are sufficient?
(i) Speed of the train B
(ii) Length of the train A
(iii) Length of the train B

A $150 \mathrm{m}$ long train takes $10$ seconds to pass a man who is going in the same direction at the speed of $2 \mathrm{km}/\mathrm{hr}$. What is the speed of the train?