Benedict and Samuel began jogging from the same starting point but in opposite directions along a straight line. They each jogged for half an hour. At the end of the jog, they were 10.5 km apart. Benedict's average speed was 120 m/min.

1. Calculate the distance Benedict jogged in metres

$\text{Distance} = \text{Speed} \times \text{Time}$
$\text{Distance} = 120 \text{ m/min} \times 30 \text{ min} = 3600 \text{ m}$

2. Convert the distance to kilometres

$3600 \text{ m} = 3.6 \text{ km}$

1. Calculate the distance Benedict jogged in half an hour

Time $= 30$ min
Benedict's distance $= 120 \text{ m/min} \times 30 \text{ min} = 3600 \text{ m} = 3.6 \text{ km}$

2. Calculate the distance Samuel jogged

Total distance apart $= 10.5 \text{ km} = 10500 \text{ m}$
Samuel's distance $= 10500 \text{ m} - 3600 \text{ m} = 6900 \text{ m}$

3. Calculate Samuel's average speed in m/min

Samuel's average speed $= \frac{6900 \text{ m}}{30 \text{ min}} = 230 \text{ m/min}$