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Q. No.Two cities \(X \) and \(Y\) are connected by a regular bus service with a bus leaving in either direction every \(T~\text{min}.\) A girl is driving scooty with a speed of \(60~\text{km/h}\) in the direction \(X\) to \(Y\) notices that a bus goes past her every \(30~\text{minutes}\) in the direction of her motion, and every \(10~\text{minutes}\) in the opposite direction. Choose the correct option for the period \(T\) of the bus service and the speed (assumed constant) of the buses.
| 1. | \(10 ~\text{min},~ 90~ \text{km/h}\) | 2. | \(15 ~\text{min},~ 120~ \text{km/h}\) |
| 3. | \(9 ~\text{min},~ 40~ \text{km/h}\) | 4. | \(25 ~\text{min},~ 100~ \text{km/h}\) |
Subtopic: Â Relative Motion in One Dimension |
 53%
Level 3: 35%-60%
NEET - 2025
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A person standing on the floor of an elevator drops a coin. The coin reaches the floor in time \(t_1,\) if the elevator is moving uniformly and time \(t_2,\) if the elevator is stationary. Then:
| 1. | \(t_1<t_2 \) or \(t_1>t_2 \) depending upon whether the lift is going up or down. |
| 2. | \(t_1<t_2 \) |
| 3. | \(t_1>t_2 \) |
| 4. | \(t_1=t_2 \) |
Subtopic: Â Relative Motion in One Dimension |
 54%
Level 3: 35%-60%
NEET - 2019
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