How to do expected frequency for chi^2 goodness fit test ​

The means and mean absolute deviations of the individual times of members on two 4x400-meter relay track teams are shown in the table below. means and mean absolute deviations of individual times of members of 4x400-meter relay track teams team a team b mean 59.32 s 59.1 s mean absolute deviation 1.5 s 245 what percent of team b's mean absolute deviation is the difference in the means? 9% 15% 25% 65%

Ineed to know the answer to this algebra question.

When a valve is open 281 gallons of water go through it in one hour the number of gallons that would go through in 94 hours is