完成下列单位换算：20min=h72km/h=m/s．

Question

完成下列单位换算：
20min=______h          
72km/h=______m/s．

Answer 1

①∵1min=(1)/(60)h，∴20min=20×(1)/(60)h=(1)/(3)h≈0.33h；
②∵1km/h=(1)/(3.6)m/s，∴72km/h=72×(1)/(3.6)m/s=20m/s．
故答案为：0.33；20．