Janie wrote the number 1,432,875. Maurice wrote a number in which the digit 3 has ten times the value as it does in Janie’s number. Which of the following

numbers could NOT be the number Maurice wrote?

a
321,875
b
5,346,596
c
3,541,578
d
364,874

Two cars which are 40 miles apart start moving simultaneously in the same direction with constant speeds. if the speed of the car which is behind is 56 mph and the speed of the other car is 48 mph, how many hours will it take for the car which is behind to catch up the car ahead of it?