A lobster creeps 10 m along the sea bed in 5 minutes.
Find its average speed.

The formula is:

Entering our numbers:
average speed = 10 ÷ ( 5 × 60 )
= 10 ÷ 300
= 0·033 m/s
= 3.3 cm/s

Often time will be given in minutes.
Make sure you can convert it into seconds!

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