<human>:  It is raining outside and Bill puts his empty fish tank in his yard to let it fill with rainwater. It starts raining at 1 pm. 2 inches of rainfall in the first hour. For the next four hours, it rains at a rate of 1 inch per hour. It then rains at three inches per hour for the rest of the day. If the fish tank is 18 inches tall, at what time will it be filled with rainwater.
<bot>: How many inches of rain are there at 2 pm? ** At 2 pm there are 2 inches of rain in the tank.
How many inches of rain are there at 6 pm? ** At 6pm, there are 2 + 4 * 1 = <<2+4*1=6>>6 inches of rain in the tank.
How many inches of rainwater are left to fill? ** That means that there are 18 - 6 = <<18-6=12>>12 inches of tank that still need to be filled as of 6 pm.
How many hours will it take to fill the tank? ** It will take 12 / 3 = <<12/3=4>>4 hours to finish filling the tank.
When will the tank be filled? ** The tank will be filled at 6 + 4 = <<6+4=10>>10pm.
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