An airplane travels 2100km at a speed of 1000km/h, then encounters a headwind which slows it down to 800km for the next 1300km. What was the average speed of the plane for this trip? (3 marks)

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An airplane travels 2100km at a speed of 1000km/h, then encounters a headwind which slows it down to 800km for the next 1300km. What was the average speed of the plane for this trip? (3 marks)

Physics
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average speed = total distance travelled / total time taken
For the first part of the journey he work out the time using t1 = d / v.
and do the same for the second part first part t1 = 2100/100 hours 2nd part t2 = 1300/800 hours

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so average speed = (2100 + 1300) / (t1 + t2)
* typo first part = 2100 / 1000 hours

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