22.5
900 / 40 = 22.5
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When rounding to the nearest hundred, half will round down and half will round up, ie 100 ÷ 2 = 50 will round each way. → any number greater than or equal to 900 and less than 900 + 50 = 950 will round down to 900. ie any number n such than 900 ≤ n < 950 will round down to 900 to the nearest 100. Which means your [whole] number could be any of 900, 901, 902, ..., 949.
A quarter hour = 15 minutes = 15*60 = 900 seconds.
900
900 square meters = 0.22239484332 of an acre, which is somewhat over one-fifth of an acre.
1/4 hour is 900 seconds.