Question: A plane flying at 750 km/h takes 8 hours to travel from City A to City B. If it encounters a tailwind increasing its speed by 50 km/h, how much time will it take to return?
A) 6.5 hours
B) 7 hours
C) 7.5 hours
D) 8 hours
Solution:
Distance between City A and City B = Speed × Time = 750km/h×8hours = 6,000km
Speed with tailwind = 750 km/h + 50 km/h = 800 km/h
Return time = Distance⁄Speed = 6,000km/800km/h = 7.5hours
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