A. 19 1/7 min
B. 15 1/7 min
C. 17 1/7 min
D. 7 1/7 min
Explanation:
1/20 + 1/30 – 1/40 = 7/120
120/7 = 17 1/7
Correct Answer: 17 1/7 min ✔
Last Updated: February 08, 2020
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