A Submarine was at 145 feet below sea level. It started descending at the rate of 15 feet per minute and descended for 15 minutes

By Maya

A Submarine was at 145 feet below sea level. It started descending at the rate of 15 feet per minute and descended for 15 minutes before again rising by 205 feet. If it starts rising up at the rate of 15 feet per minute, how long will it take to reach the surface?

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Maya

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