exam Maths Puzzle Numerical Ability

1/2x-3/5=1/10+3/10

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Pump A can unload a tanker in 15 hours, Pump B can unload the same tanker in 25 hours. Because of an approaching storm, both pumps are used to empty the tanker. If the pumps begin at 2:30 a.m., what time will the job be complete? I've had good help from this site and would really appreciate it again. PLZ!!!

Each side of a regular decagon is 20 mm long. Find the length of a segment that joins the midpoint