Match the following:

Clock time		Water image
a.	8 : 15	i.	10 : 15
b.	9 : 20	ii.	7 : 55
c.	10 : 35	iii.	9 : 10
d.	10 : 55	iv.	7 : 35

Given:

Water image of a clock time, we use:

subtract the given time from 18:30 (or 17:90 if the minutes are 31 or more).

a. Clock time: 8 : 15

• Subtract 8:15 from 18:30.
• 18 hours 30 minutes - 8 hours 15 minutes = 10 hours 15 minutes.
• Water Image: 10 : 15

b. Clock time: 9 : 20

• Subtract 9:20 from 18:30.
• 18 hours 30 minutes - 9 hours 20 minutes = 9 hours 10 minutes.
• Water Image: 9 : 10

c. Clock time: 10 : 35

• Since the minutes (35) are greater than 30, we subtract from 17:90.
• 17 hours 90 minutes - 10 hours 35 minutes = 7 hours 55 minutes.
• Water Image: 7 : 55

d. Clock time: 10 : 55

• Since the minutes (55) are greater than 30, we subtract from 17:90.
• 17 hours 90 minutes - 10 hours 55 minutes = 7 hours 35 minutes.
• Water Image: 7 : 35

Hence, the correct answer is "Option 1".