6th grade Math
posted by Nicole .
I got a problem wrong and I don't know why. Here it is: A highway construction warning sign blinks on and off. In all, the sign is on for 0.88 of each minute. For how many seconds is the sign on in 5 minutes? I multiplied 0.88 x 5 and got 4.40 but it was marked wrong. What did I do wrong?

0.88 * 60 = 52.8 seconds
52.8 * 5 = 264 seconds