We need to first convert everything to the same units. Let's change it to seconds. There are 60 seconds in a minute, so 63 minutes is 63 * 60 = 3780 seconds and 15 minutes, 45 seconds is 15 * 60 + 45 = 945 seconds.
Now, in order to find how many times as fast the rate going up was than the rate going down was, we divide the ascending rate by the descending rate:
