If you're looking for a meeting place or a good stop around ½ or halfway between Salt Lake City and Pleasant Grove, you can try Draper, UT, which is about 19 minutes south of Salt Lake City, or about 19 minutes northwest of Pleasant Grove.
About ⅓ or a third of the way, you can stop at Midvale, UT. This is about 13 minutes south of Salt Lake City.
About ⅔ or two thirds of the way, you can stop at Nash, UT. This is about half an hour south of Salt Lake City, or about 13 minutes northwest of Pleasant Grove.
About ¾ or three fourths of the way, you can stop at Lehi, UT. This is about half an hour south of Salt Lake City, or about 11 minutes west of Pleasant Grove.
If you drive straight through without stopping at all, the total distance is 36 miles. The distances shown above don't include local roads to get into each town, so if you're planning a long road trip, make sure you factor in traffic and road conditions, rest stop breaks, and interesting detours along the way. If you're in a rush, you can do the trip with zero stops, and your total travel time would be around 38 minutes.