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If one student solve 10 questions in 5 minutes and second student solve 20 questions in 5 minutes, then in how many minutes both the students together solve the 300 questions?

If one student solve 10 questions in 5 minutes and second student solve 20 questions in 5 minutes, then in how many minutes both the students together solve the 300 questions? Correct Answer 50 minutes

Given

10 questions solve in 5 minutes by one student

20 questions solve by second student in 10 minutes

Concept: 

Use unitary method

First find the time to solve one question by each of the student.
 

Calculation

First student solve question in 1 minute = 10/5

= 2 questions

Second student solve question in 1 minute = 20/5

= 4 questions

Number of questions solve in 1 minute by both the students together

= 2 + 4 = 6

300 question solve in 50 minutes

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