The speed of a motorboat in still water is four times the speed of a river. Normally, the motorhoat takes one minute to cross the river to the port straight across on the other bank. One time, due to a motor problem, it was not able to run at full power, and it took four minutes to cross the river along the same path. By what factor was the speed of the boat in still water reduced? (Assume that the speed of the water is uniform throughout the whole width of the river.)
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