1.1. The speed-time graph shows 20 seconds of a car journey.

Harry wants to estimate the distance the car travels in this time.

He uses a triangle and a trapezium, as shown, to estimate the area under the graph.

Complete Harry’s method to estimate the distance the car travels.

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1.2. For this journey, which of these is true for Harry’s method? Tick one box.

$□$      It works out an overestimate of the distance

$□$        It works out an underestimate of the distance

$□$      It could work out an overestimate or an underestimate of the distance