Ehsan can mow the lawn in 30 mintues, and together with his brother Asif, they can mow the lawn in 20 mintues. How long would it take for Asif working alone to mow the lawn?

Ehsan can mow the lawn in 30 mintues, and together with his brother Asif, they can mow the lawn in 20 mintues. How long would it take for Asif working alone to mow the lawn?

A ½ hour

B 3/4 hour

C 1 hour

D 3/2 hours

Solution

Correct Answer: Option C