The diameter of the circular pipe conveying concrete in the construction site is 10 cm. The velocity of concrete in the pipe is 35 meters per minute. A truck of concrete has 7 cubic meters, How many minutes can the whole delivery be completed? (the number obtained shall be kept to one decimal place)

10cm = 0.1M
(0.1 △ 2) &# 178; × 3.14 = 0.0785 (M2)
0785 × 35 = 2.7475 (M3)
7 △ 2.7475 ≈ 2.5 (min)
A: only 2.5 points can complete the transportation
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