Alice and Bob drive at constant speeds toward each other on a…

Alice and Bob drive at constant speeds toward each other on a highway. Alice drives at a constant speed of 30 km per hour. At a certain time they pass by each other, and then keep driving away from each other, maintaining their constant speeds. If Alice is 100 km away from Bob at 7 am, and also 100 km away from Bob at 11 am, then how fast is Bob driving (in kilometers per hour)?

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #70701