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どなたか優秀な方、以下のMATH３問（powerprep）の解説をお願いします。どうかよろしくお願いします。
A certain clock marks every hour by striking a number of times equal to the hour and the time required for a stroke is exactly equal to the time interval between strokes. At 6:00 the time lapse between the beginning of the first stroke and the end of the last stroke is 22 seconds. At 12:00, how many seconds elapse between the beginning of the first stroke and the end of the last stroke?
A 72
B 50
C 48
D 46○
E 44
私はE 44としてしまいました。
A store currently changes the same price for each towel that it sells. If the current price of each towel were to be increased by $1, 10 fewer of the towels could be bought for $120, excluding sales tax. What is the current price of each towel?
A $1
B $2
C $3○
D $4
E $12
私はE$12としてしまいました。
If Zｎ=1, what is the value of Z?
(1) n is a nonzero integer
(2) Z>0
○C(BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.)
私はA(Statement (1) ALONE is sufficient, but statement(2) alone is not sufficient.)にしてしまいました。
以上
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