18 km/h
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6 is 30 less than 6 times itself. Suppose the number is x. Then 6 times itself is 6x. 30 less than that is 6x - 30 So x = 6x-30 so that 5x = 30 and then x = 6
10 sec/1 min = 10 sec/60 sec = 1/6
time = distance / speed = 30 miles / (6 miles/hour) = 5 hours.
1 min = 60 sec 1 hour = 60 min = 60 × 60 sec = 3600 sec 1,609.344 m = 1 mile (exactly) It will travel: Distance = speed × time = 253 m/s × 6 hours = 253 m/s × 6 × 3600 s = 5,464,800 m = 5,464,800 ÷ 1,609.344 miles ≈ 3,395.70 miles.
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