Whenever we have to tackle a question involving speed, distance and time, we should always refer to the distance-speed-time triangle. This helps us establish whether the question requires division or multiplication. As always, we need to be careful with the units and should convert units to the units required in the answer before we start.

**Example**

**Exercise**

Let’s complete exercise 39 from pages 116 and 117 of the core textbook:

The answers are below: