If a bus travels 160 km in 4 hours and a train travels 320km in 5 hours at uniform speeds, then the ratio of the distances travelled by them in one hour is
As speed = 
Speed of bus = 40km/hr
Speed of train = 64km/hr
Distance travelled in 1 hr by bus = 40km
Distance travelled in 1 hr by train = 64km
Ratio of distance travelled by bus to train = 
In questions 11 to 15, find the missing number in the box in each of the proportions:
Let blank = x
10