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25 Mar 2020, 03:14
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E
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Difficulty:
35%
(medium)
Question Stats:
71% (02:29) correct
29%
(02:54)
wrong
based on 115
sessions
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Linda and Lisa, who are 200 meters apart, start moving at the same direction. If Linda walks at the rate of 20 kmph and Lisa walks at the rate of 15 kmph. What is the distance covered by Lisa by the time Linda catches up?
A. 200 m
B. 300 m
C. 400 m
D. 500 m
E. 600 m
A. 200 m
B. 300 m
C. 400 m
D. 500 m
E. 600 m
25 Mar 2020, 04:00
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Bunuel
Given: Linda and Lisa, who are 200 meters apart, start moving at the same direction.
Asked: If Linda walks at the rate of 20 kmph and Lisa walks at the rate of 15 kmph. What is the distance covered by Lisa by the time Linda catches up?
Linda's speed = 20 kmh = 20*1000/60*60 = 100/18 = 50/9 m/s
Lisa's speed = 15 kmh = 15*1000/60*60 = 75/18 = 25/6 m/s
Their relative speed = 25/18 m/s
200 = 25/18 *t
t = 200 * 18/25 = 8*18 secs
Distance covered by Lisa = 8*18 * 25/6 = 24*25 = 600 m
IMO E
25 Mar 2020, 04:03
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Bunuel
Other method:-
Relative speed = 5 kmh
Lisa's speed = 15 kmh
If time is same,
v1/v2 = d1/d2
Let the distance travelled by Lisa be D
15/5 = D/200
D = 600 m
IMO E
