An hour-long test has 60 problems. If a student completes 30 problems in 25 minutes, then the required seconds he has taken on average for computing each of the remaining problems is?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 70 seconds
Total number of problems = 60
Total time for test = 1 hour = 60 min
Remaining questions = 60 - 30 = 30
Remaining time = 60 - 25 = 35 min = 35 × 60 sec
Rate of time required to solve remaining problems = 30×60/30 = 70 sec