Question

A mathematics lesson starts at $11:05$.
The lesson lasts for $75$ minutes.
Work out the time that the lesson ends.

Answer 1

Time at which the mathematician starts his work $11:05$

$60$ min make up to an hour

So after $60$ min The time is $12:05$

So $75-60=15$ min are remaining

After $15$ min the time is $12:20$