Answer asap! must be correct with with with with with with an explanation to get the brainliest answer and !

Factor the monomial completely 42a3b3

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

8.74 rounded to the nearest whole number