Question 712516
speed*time=distance.  Your rate units are kilometers per hour and your time is in mixed units of hours and minutes.  For simplicity you should decide if you want strictly to change all to hours or all to minutes.  14 minutes is (14/60) of an hour.  You might want then {{{6&14/60}}} hours.


CALCULATION

rate * time, (kilometers/hour)*hours= kilometers.


Again reminder, 14/60 is the fraction of an hour more than 6 hours to be included as given.


{{{highlight(87*(6&14/60)=87*((360+14)/60))}}}
={{{87*(374/60)=32538/60}}}
={{{highlight(542.3)}}} kilometers