Ehsan can mow the lawn in 30 minutes, and together with his brother Asif, they can mow the lawn in 20 minutes. How long would it take for Asif working alone to mow the lawn?
A. 1/2 hour
B. 3/4 hour
C. 1 hour
D. 3/2 hours
E. None of these
সঠিক উত্তরঃ
C.
1 hour
Explanation:
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