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anonymous
 one year ago
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)
anonymous
 one year ago
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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welshfella
 one year ago
Best ResponseYou've already chosen the best response.2average speed = total distance travelled / total time taken

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2For the first part of the journey he work out the time using t1 = d / v.

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2and do the same for the second part first part t1 = 2100/100 hours 2nd part t2 = 1300/800 hours

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2so average speed = (2100 + 1300) / (t1 + t2)

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2* typo first part = 2100 / 1000 hours
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