In two cases, I will meet Xiaoling. Ten minutes later, the return speed of the original road is five-quarters of the original speed.

(1 0-8) ÷10×100% ("Xiaoling era1")

=2÷ 10× 100%

=20%

(1/8-110) ÷1/8×100% ("1"in "Xiaoming Speed")

= 1/40÷ 1/8× 100%

=20%