How can you find this one?

Question

A driver travelled 22 km in 15 min, then stopped for lunch for 25 min, and then drove another 34 km in 20 min. What was the average speed while the car was moving? What was the average speed for the entire trip?

Answer 1

Not counting the break,

 

 (22+34)/(15+20) = 56/35 = 8/5 = 1.6 km per min

 

 

For the entire trip:

   (22+34)/(15+20+25) = 56/60 = 28/30 = 14/15 = .93 km per min