其它
Teacher Jason leaves home every day at $8:00\text{AM}$ to go to work. If he drives at an average speed of $40$ km/h, he will be late by $3$ minutes. If he drives at an average speed of $60$ km/h, he will be early by $3$ minutes. How many km/h does Teacher Jason need to drive to get to work exactly on time? 
Overseas Competition->Knowledge Point->Calculation Modules
B 