Question 1101219
If they traveled the whole trip at 32 mph, they would travel 320 miles 32*10=320
If they traveled the whole trip at 48 mph, they would travel 480 miles 48*10=480
So it is somewhere in between 320 and 480. but we want only one way
Which of the choices is BETWEEN 160 and 240? It can't be 160. 192 looks good. 

32/48=2/3
2x+3x=10
5x=10
x=2
2x=4
3x=6
6 hours at 32 6*32=192
4 hours at 48 4*48=192
So it is indeed 192