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At Srinagar, starting at 9 a.m. on a ...

At Srinagar, starting at 9 a.m. on a certain day, snow began to fall at a rate of `1 1/4` inches every two hours until 3 p.m. If there was already `2 1/4` inches of snow on the ground at 9 a.m., how many inches of snow was on the ground at 3 p.m. that day? `3 3/4` (b) `6` (c) `7` (d) `7 1/2`

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