Question 939133
Distance =85 km
Time= 2 hr  25 min
1 hr =60 min
25 min= 25/60 hr= 5/12 hr
Time= 2 hr 25 min={{{ (2+(5/12))}}}
      ={{{2*(12/12)+(5/12)}}}
      ={{{24/12 +5/12}}}
={{{(24+5)/12}}}
={{{29/12}}}

Speed=distance/time
={{{85/29/12}}}
={{{85*12/29}}}
=35.17 kmph

Average speed= 35.17 kmph