A car travels uphill at 30 km/hr and downhill at 90 km/hr. It goes 100 km uphill and 50 km downhill. Find the average speed of the car? Answers:  A) 32kmph  B) 39kmph  C) 34kmph  D) 35kmph  E) 36kmph
avg speed=total distance/total time.   total distance traveled=100+50= 
<gadget id="calculator">100+50</gadget>
<output>150</output>
150km;   time taken for uphill journey=100/30=10/3;   time taken for down hill journey=50/90=5/9;   avg speed=150/(10/3+5/9)=39kmph   ANSWER:39kmph
<result>B</result>
A car travels uphill at 30 km/hr and downhill at 90 km/hr. It goes 100 km uphill and 50 km downhill. Find the average speed of the car?