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The frequency of an ambulance's siren is 700 Hz.

If a pedestrian on the side of the road hears the siren at 756 Hz, approximately how fast and in what direction is the ambulance moving?

a- There is not enough information
b- 25 km/h, away from the pedestrian
c- 90 km/h, towards the pedestrian

d- 90 km/h, away from the pedestrian

e- 25 km/h, towards the pedestrian

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