A car travels in along a straight road

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Kinematics · Kinematics

Problem

A car travels 120 km120\,\text{km} in 2 h2\,\text{h} along a straight road, then turns back and covers 60 km60\,\text{km} in 1 h1\,\text{h} along the same road. What is the average speed for the whole journey? (a) 70 km/h70\,\text{km/h} (b) 45 km/h45\,\text{km/h} (c) 60 km/h60\,\text{km/h} (d) 90 km/h90\,\text{km/h}

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