Teacher takes about 25 minutes to make out a test for a mathematics class. How long will it take to make out tests for all five classes?

How many grams must be adde to 970g to make 1 and a half kg

Consider the reaction 2x2y2+z2⇌2x2y2z which has a rate law of rate= k[x2y2][z2] select a possible mechanism for the reaction.

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?