英语翻译paula goes for a 30-minute run.for the first 20 minutes
英语翻译
paula goes for a 30-minute run.
for the first 20 minutes she runs at an average speed of 9 miles per hour.
in the next 10 minutes she runs a distance of 1 mile.
work out the average speed for her 30-minute run.
give your answer in miles per hour.
只是解释句子的意思就好了
还有mph是什麽意思?
THANKS!
还有
how many times heavier?
give you answer to an appropriate degree of accuracy.