The length of a pipe is 1 km and its diameter is 20 cm. If the diameter of an equivalent pipe is 40 cm, then its length is
A. 32 km
B. 20 km
C. 8 km
D. 4 km
Answer:A
The length of a pipe is 1 km and its diameter is 20 cm. If the diameter of an equivalent pipe is 40 cm, then its length is
A. 32 km B. 20 km C. 8 km D. 4 km