exam Maths Puzzle Numerical Ability

One number is 3 less than another. If 7 times the smaller number minus 3 times the larger number is 7, find the two numbers.

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CAN SOMEONE PLEASE HELP ME WITH THIS PROBLEM:
If g(x)= 3f(x) and f(13) = 12, then g(13)= At 9am a truck leaves the truck yard and travels west at a rate of 45 mi/hr. Two hours later, a second truck leaves along the same route, traveling at 75 mi./hr/ When will the second truck catch up to the first?