A car was driving at 66 Km/h for 30 minutes, and then at 100 Km/h for another 45 minutes. What was its average speed?  Options:  A) 84.  B) 75.  C) 70.  D) 65.  E) 54.
driving at 66 Km/h for 30 minutes ,distance covered = 60*1/2= 
<gadget id="calculator">60*1/2</gadget>
<output>30</output>
30 km   driving at 100 km/h for 45 minutes ,distance covered= 100*3/4= 
<gadget id="calculator">100*3/4</gadget>
<output>75</output>
75 km   average speed= total distance/total time = 105/1.25= 
<gadget id="calculator">105/1.25</gadget>
<output>84</output>
84 km/h   84.nswer: 84.
<result>A</result>
A car was driving at 66 Km/h for 30 minutes, and then at 100 Km/h for another 45 minutes. What was its average speed?