A flight departs at 2:15 PM and lands 3 hours 40 minutes later. What time does the flight land?

Add the hours first: $2{:}15$ PM plus $3$ hours is $5{:}15$ PM. Then add the $40$ minutes: $5{:}15+0{:}40=5{:}55$ PM, choice H. Choice F ($5{:}15$ PM) adds only the $3$ hours. Choice G ($5{:}40$ PM) adds only the $40$ minutes to $5{:}00$, ignoring the $15$ minutes. Choice J ($6{:}15$ PM) adds a full $4$ hours, which would happen if you rounded $3$ hours $40$ minutes up. Time problems need care when minutes pass $60$, but here $15+40=55$, which stays within the hour.