Ryan and Mary are both travelling by train. Ryan's train travels 80 km in 50 minutes.
Mary's train travels 270 km.
It leaves at 13:10 and arrives at 15:25.
Work out the difference, in km/h, between the average speed of their trains.

Graph y ≥ -x^2 - 1. click on the graph until the correct graph appears.

Gexpressions: practice question 3 of 5 jackson wants to study the popularity of his music video by tracking the number of views the video gets on his website. the expression below represents the total number of views that jackson's video receives n days after he begins tracking the nu views, where b is the rate at which the number of views changes. alb)" select the statement that would accurately describe the effect of tripling a, the initial number of views before jackson beginst the rate at which the number of views changes, b, will triple. the total number of views the video has after n days, a(b)", will not change. the total number of days since jackson begins tracking views, n, will be reduced by one-third. the total number of views the video has after n days, alb)", will triple. submit

In priyas math class there are 10 boys and 15 girls. what is the ratio of boys to girls in priyas math class? express your answer as a decimal