Question

Alastair drives 18.2 miles in 14 minutes.

He passes a sign which gives the speed limit as 50 mph.
By how much, in mph, did Alastair's average speed exceed the speed limit?

Answer 1

28mph

Explanation:

Answer 2

28 mph

Explanation:

Distance

• 18.2 miles

Time

• 14 min = 14/60 hr

Average speed

• d/t = 18.2 ÷ 14/60 = 182/10 × 60/14 = 78 mph

The difference with allowed speed

• 78 - 50 = 28 mph