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. \(9 ~\text{min},~ 40~ \text{km/h}\)
3. \(25 ~\text{min},~ 100~ \text{km/h}\)
Subtopic:  Relative Motion in One Dimension |
From NCERT
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:  Relative Motion in One Dimension |
 53%
From NCERT
NEET - 2019
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital