Good Riddles

Question: How do you make seven an even number?

Question: There were 2 trains heading the opposite directions on the same track.1 was going North, and one was going south, There was a 100m gap between them, avoiding the collision, 2 men saved the trains from colliding on time, Who were they and how did they save them?

Question: Why was the calendar worried?

Question: What room can you not go into?

Question: On a late Sunday evening, April was found dead in her apartment. The police questioned the three suspects. Melanie: "I was at the mall shopping." Delancey: "I was working at the post office." John: "When I came back by 2 PM, I found her dead. Who killed April and explain the reason.