A train travels the distance from Blaenau Ffestiniog to Wrexham in Wales in 2 hours and 15 minutes. If these two places are 135 km apart, what is the average speed of the train in kilometres per hour?

60 km/h

Explanation:

to calculate speed: distance ÷ time

so, 135 ÷ 2.25 = 60km/h

note: 2.25 is 2 1/4 which is the 2 hours and 15 minutes

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation: