Darius needs to solve 45 math problems for his homework assignment. He already completed 15 of the problems in morning study hall. He then worked from 3:15 to 4:30 to complete the remainder of the problems. How many minutes does it take Darius to complete one problem?
Answer
A) 2/5 minute
B) 1 1/4minutes
С) 1 2/3minutes
D) 2 1/2minutes

Option D: minutes is the correct answer.

Step-by-step explanation:

Given that:

Darius needs to solve 45 math problems. He as already solved 15 problems.

Remaining problems to be solved = Total - Already solved

Remaining problems = 45-15 = 30 problems

Time worked = 3:15 to 4:30 = 75 minutes

Darius have 75 minutes to solve 30 problems.

Time for one problem =

Time for one problem =

Time for one problem =

It takes Darius minutes to complete one problem.

Hence,

Option D: minutes is the correct answer.