What flammable gas is produced if sodium borohydride is mixed with water?

Can someone me with questions 12 and 13 plz.

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.