Question

a truck travels 15 km in 30 minutes going east to west. what is the average velocity of the truck?
a 30 km/h west
b 0.5 km/h west
c 30 km/h
d 0.5 km/h

Explanation:

Step1: Convert time to hours

30 minutes = 0.5 hours

Step2: Calculate average velocity

Average velocity = displacement / time = 15 km west / 0.5 h = 30 km/h west? Wait, no—wait, 15 km divided by 0.5 h is 30 km/h? Wait no, wait 15/0.5 is 30. Wait but option B is 0.5 km/h west? Wait no, wait maybe I misread. Wait the question says 15 km in 30 minutes. 30 minutes is 0.5 hours. Velocity = displacement/time = 15 km west / 0.5 h = 30 km/h west? But option A is 30 km/h west, B is 0.5 km/h west. Wait wait no, wait 15 km divided by 30 minutes: if time is in minutes, 15 km /30 min = 0.5 km/min, but converted to km/h: 0.5 km/min *60 min/h=30 km/h. Oh! So the correct answer is A? Wait no, the options: A is 30 km/h west, B is 0.5 km/h west. Wait I think I made a mistake earlier. Let's recalculate:

Displacement = 15 km west (since direction is specified for velocity). Time = 30 minutes = 0.5 hours. So velocity = 15 km /0.5 h =30 km/h west. So option A? But the original answer I thought was B, but no—wait 0.5 km/h is way too slow. Oh right! 15 km in half an hour is 30 km per hour. So the correct answer is A? Wait but let's check again. Oh wait, maybe the question was written wrong? No, the user's image says: A truck travels 15 km in 30 minutes going east to west. So displacement is 15 km west. Time is 0.5 h. So velocity is 30 km/h west, which is option A. So my initial mistake was miscalculating. So correct answer is A.

Wait wait, let's confirm: 30 minutes is 0.5 hours. 15 km / 0.5 h = 30 km/h. Yes. So the answer is A. 30 km/h west.

Step1: Convert time unit

30 minutes = 0.5 hours

Step2: Compute average velocity

Average velocity = displacement/time = 15 km west / 0.5 h = 30 km/h west

Answer:

B. 0.5 km/h west