Question

b.
2 h 17 min 24 s-1 h 15 min 50 s

Answer 1

$\tt 2h~17min~24s=1h~76min~84s\\\tt 2h~17min~24s-1h~15min~50s=1h~76min~84s-1h~15min~50s\\\tt=61min~34s=1h~1min~34s$