Question

A car travels a distance of 80 km. For the first 30 minutes it is driven at a constant speed of 80 km/h. The motor begins to vibrate and the driver reduces the speed to 40 km/h for the rest of the trip. The average speed for the entire trip is:

a) 47.5 km/h.

b) 53.3km/h.

c) 60.0 km/h.

d) 50.0km/h.

e) 40.0 km/h.

Answer #1

Average speed is defined as distance/time taken.

Here distance = 80 km

Time taken = 30 min + time for the remaining distance

Time for remaining distance = ?

In 30 min, the vehicle travels a distance of 40 km( speed x time = 80 x 0.5)

Remaining 40km in 40 km/hr speed can be traveled in 1hr.

Hence total time = 1.5 hr

Average speed = 80/1.5 = 53.33 km/hr

**Answer:---> Option (b)**

Effort has taken to make the explanation as descriptive as possible so that you will understand the basic concepts. Hope the answer helps you. All the best wishes for your studies ?

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