Question

A car travels at a rate of 25 km/hr for 1.5 hours, then is stopped behind a train for .50 hours, and finally at 21 km/hr for 1.25 hours.

Answer 1

The average speed of the car is 19.62 km/hr.

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find the average speed of the car

The given parameters;

initial velocity of the car, u = 25 km/hr

time of motion of the car, t= 1.5 hr

final velocity, v = 21 km/h

time of motion, = 1.25 hr

The average speed of the car is calculated as follows;

$average \ velocity = \frac{total \ distance }{total \ time} \\\\average \ velocity = \frac{(25 km/h \times 1.5h)+(21km/h\times 1.25hr)}{(1.5h + 0.5h + 1.25h)} \\\\average \ velocity = 19.62 \ k m/hr$

Thus, the average speed of the car is 19.62 km/hr.

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