(2i)/(3-5i) HELP ASAP --- algebra 2 question

Cody started biking to the park traveling 15 mph, after some time the bike got a flat so cody walked the rest of the way, traveling 4 mph. if the total trip to the park took 6 hours and it was 46 miles away, how long did cody travel at each speed? solve using rate times time= distance

The longer leg of a 30-60-90 trangle is 18

Need answer asap (see image) (20 points)