A Bullock cart can travel at 10 kmph uphill road and downhill road 20 kmph. He takes 3 hours to row from lower point A to upper point B and back to A. What is the total distance traveled by bullock card in 3 hours? He must return back to base point A in remaining time.
Choose the correct choice from the following.
A) 80	B) 20	C) 30	D) 40	E) 60
Upward distance traveled per hour - 10 km,   distance traveled after 2 hours = 20 km.   He remained with 1 hour travel downward, i.e. distance traveled in remaining 1 hour downward = 20 km   so total distance traveled from A to B and Back to point A = 20 km upward + 20 km downward = 40 km   (Answer : 40)
<result>D</result>
A Bullock cart can travel at 10 kmph uphill road and downhill road 20 kmph. He takes 3 hours to row from lower point A to upper point B and back to A. What is the total distance traveled by bullock card in 3 hours? He must return back to base point A in remaining time.