Answer:
3 hours 5 minutes
Explanation:
Had he skied 5 minute longer, he would have skied for 4 hours, leaving 3 hours for snowboarding. Since he skied 5 minutes less than 4 hours, he snowboarded 5 minutes more than 3 hours.
You can also just subtract the times.
7 hours - 3 hours 55 minutes =
= 6 hours 60 minutes - 3 hours 55 minutes
= 3 hours 5 minutes
Answer: 3 hours 5 minutes