Problem 2-62 - Distance and speed - Part 7 (b)

A truck travels at \(80 \;km/h\) for \(30 \;min\), then at \(60\; km/h\) for \(1.5 \;hr.\) Assuming 2 significant digits in the given numbers, calculate the truck's
(a) total distance traveled, and
(b) average speed.

Accumulated Solution

\(\text{speed} = \frac{d}{\Delta t} \\ d = \text{(speed)} \Delta t \\ d_1 = 40\; km \\ d_2 = 90 \;km \\ d = 90 + 40 = 130\; km \text{(Answer to part (a))}\)

Correct!

\(\text{Speed}_{av} = 1.3 \times 10^2\; km/2\; hr = 65\; km/hr \; \text{(answer to part (b))}\)

You have completed this problem.