A helicopter covers a distance in 4 hours at 280 km/h. To complete the same journey in 50 minutes, what speed is needed?

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Accepted Answer

1. Find the distance: $d=280	imes4=1120\ 	ext{km}$.  
2. Convert time: $50\ 	ext{min}=50/60=5/6\ 	ext{h}$.  
3. Required speed: $v=d/t=1120\div(5/6)=1120	imes6/5=1344\ 	ext{km/h}$.  
4. So the needed speed is **1344 km/h**, choice (a).  
FINAL_ANSWER: a

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