A. 7 min
B. 8 min
C. 9 min
D. 10 min
Explanation:
1/10 + 1/15 = 1/6 * 4 = 2/3
1 – 2/3 = 1/3
1/10 + 1/15 – 1/x = 1/3
x = 8
Correct Answer: 8 min ✔
Last Updated: February 08, 2020
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