A car during its journey travels 30 minutes at a speed of 60 kmph, another 45 minutes at a speed of 60 kmph, and 2 hours at a speed of 80 kmph.The average speed of the car is Choose the correct choice from the following answers:
A) 63.07 kmph
B) 64 kmph
C) 72.30 kmph
D) 64.02 kmph
E) None of these
First car travels 30 min at speed of 60 kmph   distance = 60 x 1/2 = 30 m   Then car travels 45 min at a speed of 60 kmph   distance = 45 min at speed of 60 kmph   distance = 60 x 3/4 = 45 m   at last it travels 2 hours at speed of 70 kmph   distance = 80 x 2 = 160 m   Total distance = 30 + 45 + 160= 
<gadget id="calculator">30 + 45 + 160</gadget>
<output>235</output>
235   Total time= 1/2 + 3/4 + 2= 
<gadget id="calculator">1/2 + 3/4 + 2</gadget>
<output>13/4 = around 3.25</output>
3.25   Average speed of the car= 235/3.25 = 72.30   ANSWER:72.30 kmph
<result>C</result>
A car during its journey travels 30 minutes at a speed of 60 kmph, another 45 minutes at a speed of 60 kmph, and 2 hours at a speed of 80 kmph.The average speed of the car is