went thru a distance of 42.9 kilometers in 15 minutes and 41 seconds
went thru a distance of 42.9 kilometers in 15 + 41/60 min
went thru a distance of 42.9 kilometers in 941/60 min
went thru a distance of 42.9 kilometers in 941/3600 hr
Speed= 42.9 divided by 941/3600 kmph
= 42.9 x 3600/941=164.12 kmph