Question

You are leaving for a party at your cousin’s house in a city that is 150 km away. You will travel at an average rate of 50 km/hr. How long will it take you to arrive? hours If you need to be at the party in 2.5 hours, how fast would you need to drive to get there? km/hr

Answer 1

I think it'll be 60 km/hr.

I think I'm wrong though. Please tell me if I'm wrong, thanks.

Answer 2

3.0 h; 60 km/h

Explanation:

Part 1:

The formula for speed (s) as a function of distance (d) and time (t) is

s = d/t Multiply by t

st = d Divide by s

t = d/s

d = 150 km

s = 50 km/h Calculate the time

t = 250/50

t = 3.0 h

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Part 2:

t = 2.5 h Calculate the speed

s = 150/2.5

s = 60 km/h