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There is a plane that flies 360 kilometers in 4 hours with the wind. Today, it leaves for a place to go with the wind and return against the wind. The return time is 3 hours longer than that of the past. Given that the speed against the wind is 75 km / h, how many kilometers is it from the destination? Not equations and assumptions, but formulas and analysis.
Follow the wind for 4 hours and fly 360 kilometers
The downwind speed is 90 km / h,
The time of return is 3 hours more than that of the past. The known headwind speed is 75 km / h
The downwind time: 75 × 3 △ 90-75 = 225 △ 15 = 15 hours
The distance from the destination is 90 × 15 = 1350 km
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