Answers
volume = 20 yards^3 / hr
1 yard = 3 ft
1 hour = 3600 seconds
= 0.15ft3/sec
20 yards^3 / hour
1 yard = 3 ft
1 cubic yard = (3)^3 ft^3
1 cubic yard = 27 ft^3
therefore
20 cubic yard = 20 x 27 = 540 ft^3
1 hour = 60 mins
therefore we can write
540 / 60 = 9 ft^3/min.
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