0.004 km.
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A 40m hill IN 10sec? 144 km/h or 89mph.
0.0254 m = 1 in (exactly) → 40m = 40 ÷ 0.0254 in ≈ 1574.8 in
no
40m in 20 minutes 120m in 60 minutes or 1 hour 0.12km in 1 hour
40m² = 430.556 ft2