A) After 50 min
B) After 100 min
C) After 240 min
D) After 800 min
Correct Answer: B
Solution :
[b] Time taken by A, B, C to make a round \[=\frac{1000}{10}\min ,\] \[=\frac{1000}{20}\min ,\] \[=\frac{1000}{40}\min ,\] = 100 min, 50 min, 25 min Required time = LCM of 100 min, 50 min, 25 min \[=(5\times 5\times 2\times 2)=100\,\,\text{min}\] Hence, they will be together at the starting point after 100 min. |
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