A car was driving at 50 Km/h for 30 minutes, and then at 40 Km/h for another 30 minutes. What was its average speed?
Choose one:
A) 80.
B) 75.
C) 70.
D) 65.
E) 54.
driving at 50 Km/h for 30 minutes ,distance covered = 50*1/2= 
<gadget id="calculator">50*1/2</gadget>
<output>25</output>
25 km   driving at 40 km/h for 30 minutes ,distance covered= 40*1/2= 
<gadget id="calculator">40*1/2</gadget>
<output>20</output>
20 km   average speed= total distance/total time = 45/1= 
<gadget id="calculator">45/1</gadget>
<output>45</output>
45 km/h   80.nswer : 80.
<result>A</result>
A car was driving at 50 Km/h for 30 minutes, and then at 40 Km/h for another 30 minutes. What was its average speed?