Answer:
Amit spends 7.5 minutes on other miscellaneous exercises.
Explanation:
Amit works out at a gym for three quarters of an hours.
Three quarter of an hour means
minutes
He uses the treadmill for half the total workout session time, means for

He uses one third time on cycle means
minutes
Now, time spent on miscellaneous exercises =
minutes
Therefore, total time Amit spends on other miscellaneous exercises is 7.5 minutes.