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. 480 m
B. 540 m
C. 720 m
D. 500 m
Answer: Option D
Solution(By Examveda Team)
54 km/h = 54 × $$\frac{5}{{18}}$$ = 15 m/s72 km/h = 72 × $$\frac{5}{{18}}$$ = 20 m/s
The distance of BC = 15 × 20 = 300 m
The distance of AB = 20 × 20 = 400
$${\text{AC}} = \sqrt {{{400}^2} + {{300}^2}} = 500$$
Related Questions on Speed Time and Distance
A. 48 min.
B. 60 min.
C. 42 min.
D. 62 min.
E. 66 min.
A. 262.4 km
B. 260 km
C. 283.33 km
D. 275 km
E. None of these
A. 4 hours
B. 4 hours 30 min.
C. 4 hours 45 min.
D. 5 hours
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