Time unit conversion: ①、0.25h=_____ min =_______ s.②、3.6×10^9 ms= _______ h. ③、3h 20min 15s =____ s | Math enthusiast | Mathematical art

Time unit conversion: ①、0.25h=_ min =_ s.②、3.6×10^9 ms= _ h. ③、3h 20min 15s = s

0.25h=__ 15___ min =____ 900___ s.
3.6×10^9 ms= ____ 1000___ h
3h 20min 15s = 12015____ s
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