1. paulo ran a marathon in about 1.56 x 10^4 s. (a) write paulo’s time in standard notation. (b) miguel ran a marathon in 4 h and 16 min. who ran the race in the shorter amount of time? show your work.

(a) 1.56 * 10^4 s = 15,600 s

(b) Paulo took 15,600 s. We now convert that into hours and minutes.
15,600 s * (1 min)/(60 sec) = 260 min
260 min = 240 min + 20 min
Since 60 min = 1 hr, 240 min = 4 hr, so
260 min = 4 h and 20 min

Miguel took 4 h and 16 min, so Miguel took less time.