31. I'm not positive but give it a shot if it is wrong message me back!
Answer:
140 mile
Step-by-step explanation:

While x is the speed of the second train.
Answer:
8 wheel nuts
Step-by-step explanation:
a car has four wheels and wheel nuts,so the vehicle with 8 will have 8 wheel nuts
Answer:
its 1 and 3 like xy = (1,3)
He needs to magnify the fire ant 5 times, and the crab spider 4, because 20 is a common multiple for both.