A car during its journey travels 1 hour at a speed of 40 kmph, another 30 minutes at a speed of 60 kmph, and 2 hours at a speed of 60 kmph.The average speed of the car is  Select:  A) 63.07 kmph  B) 54.28 kmph  C) 62.02 kmph  D) 64.02 kmph  E) None of these
First car travels 1 hrs at speed of 40 kmph   distance = 40 x 1 = 40 m   Then car travels 30 min at a speed of 60 kmph   distance = 30 min at speed of 60 kmph   distance = 60 x 1/2 = 30 m   at last it travels 2 hours at speed of 60 kmph   distance = 60 x 2 = 120 m   Total distance = 40 + 30 + 120= 
<gadget id="calculator">40 + 30 + 120</gadget>
<output>190</output>
190   Total time= 1+ 1/2 + 2= 
<gadget id="calculator">1+ 1/2 + 2</gadget>
<output>7/2 = around 3.5</output>
3.50   Average speed of the car= 190/3.25 = 54.28   ANSWER:54.28 kmph
<result>B</result>
A car during its journey travels 1 hour at a speed of 40 kmph, another 30 minutes at a speed of 60 kmph, and 2 hours at a speed of 60 kmph.The average speed of the car is