Mathematics for IGCSE & O level - Using A Calculator (Section 4 - No. 13)

If you need to input a time of 1 hour 15 minutes into the calculator, what do you enter?

1.15

1:15

1.25

1 hour and 15 min

15 minutes is a quarter (0.25) of an hour, and therefore 1 hour and 15 minutes would be 1.25.