4. A doctor told Mikael to take a pill every 75 minutes. He took his first pill at 11:05. At what time did he take his fourth pill?
A $12: 20$
B 13:35
C 14:50
D 16:05
E 17:20
Solution
C

Mikael was told to take a pill every 75 minutes. Therefore he will take his fourth pill $3 \times 75$ minutes after he takes his first pill. Now $3 \times 75$ minutes is 225 minutes or 3 hours and 45 minutes, He took his first pill at 11:05 and hence he will take his fourth pill at 14:50.