Good question. By first counter, I mean the Least Significant Digit (LSD). Physically, you could consider the 10's digit to be the first, but logically, I consider the LSD first.Just so we're on the same page, the first counter counts from 0-5 and the second counts from 0-9, right?
OK. What would happen if you connected R1 to the clock input of the MSD counter?Since R1 is responsible for resetting the counter, it would make sense that this signal is used to trigger the 0-5 counter to increment