# Problem 2-62 - Distance and speed - Part 5

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

$\mathrm{speed = \frac{d}{\Delta t }\\ d = (speed) \Delta t \\ d_1 = 40\; km}$

The distance traveled at the second speed is:

(A)   $(60\; km/hr)(1.5\; hr) = 90\; km$

(B)   $(60 \;km/hr)/(1.5\; hr) = 40\; km$

(C)   $(60 \;km/hr)(90\; min) = 1500\; km$