SSC CHSL 2020 · PYQ · Speed, Distance and Time · medium
Two cars start from the same place at the same time at right angles to each other. Their speeds are 54 km/hr and 72 km/hr, respectively. After 20 seconds the distance between them will be:
A.540 m
B.500 m✓ Correct
C.720 m
D.480 m
Explanation
In 20 seconds: car1 travels 54×(20/3600) km = 300 m; car2 travels 72×(20/3600) km = 400 m. Since they move at right angles, distance = √(300² + 400²) = √(250000) = 500 m.
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