Question

calculate speed,if john travels 220km for 2 hour 30 minutes ,your answer must be in km per hour

Answer 1

first convert the time given in hours.
2 hours & 30 min = 2.5 hours
then recall that speed is just distance traveled over time, or
v = d/t
substituting,
v = 220/2.5
v = 88 km/hr

hope this helps~ :)