The table shows the start and the end time of two radio programmes on the same day.

Programme	Start time	End time
A	10.45 a.m.	12.20 p.m.
B	5.20 p.m.	?

Programme B is 20 minutes shorter than Programme A. At what time does Programme B end? Ans: ___ p.m.

1. Calculate the duration of Programme A

From $10.45\text{ a.m.}$ to $12.00\text{ p.m.}$ is $1\text{ hour } 15\text{ minutes}$.
From $12.00\text{ p.m.}$ to $12.20\text{ p.m.}$ is $20\text{ minutes}$.
Total duration of Programme A = $1\text{ hour } 15\text{ minutes} + 20\text{ minutes} = 1\text{ hour } 35\text{ minutes}$.

2. Calculate the duration of Programme B

Duration of Programme B = $1\text{ hour } 35\text{ minutes} - 20\text{ minutes} = 1\text{ hour } 15\text{ minutes}$.

3. Calculate the end time of Programme B

Start time of Programme B = $5.20\text{ p.m.}$
End time = $5.20\text{ p.m.} + 1\text{ hour } 15\text{ minutes} = 6.35\text{ p.m.}$