Afirefighter is standing in front of a 24 step ladder. every minute he climbs 4 steps then the next minute he climbs down 3 steps. if he starts a 9: 00, what time will he reach the first step on the top rung of the ladder?

I believe it would be 9:48 because it takes 2 minutes to go up one step, since 1 minute he goes up 4 then goes down 3 the next minute, leaving the only progress of the 2 minutes is 1 step. 
So 2 minutes for 1 step, 24 steps would be 24x2 =48 and 9:00 48 minutes later is 9:48

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