A car was driving at 72 Km/h for 20 minutes, and then at 81 Km/h for another 40 minutes. What was its average speed?	Select the correct option.
A) 76.	B) 77.	C) 78.	D) 79.	E) 80.
driving at 72 Km/h for 20 minutes ,distance covered = 72*1/3= 
<gadget id="calculator">72*1/3</gadget>
<output>24</output>
24 km   driving at 90 km/h for 40 minutes ,distance covered= 81*2/3= 
<gadget id="calculator">81*2/3</gadget>
<output>54</output>
54 km   average speed= total distance/total time = 78/1= 
<gadget id="calculator">78/1</gadget>
<output>78</output>
78 km/h   76.nswer: 76.
<result>A</result>
A car was driving at 72 Km/h for 20 minutes, and then at 81 Km/h for another 40 minutes. What was its average speed?