Question

a student walked 1.5 km in 25 minutes, and then, realizing he was late, ran the remaining 0.5 km in 5 minutes. calculate his average speed on the way to school.

Answer 1

The average speed is 4 kilometer per hour

Solution:

Average Speed is given by formula:

`\text{ Average speed } = \frac{\text{ total distance }}{\text{ total time }}`

A student walked 1.5 km in 25 minutes and then, realizing he was late, ran the remaining 0.5 km in 5 minutes

Therefore,

Total distance = 1.5 km + 0.5 km = 2 km

Total time taken = 25 minutes + 5 minutes = 30 minutes

Convert 30 minutes to hour

`1 \text{ minute } = (1)/(60) \text{ hour }`

`30 \text{ minute } = (1)/(60) * 30 \text{ hour } = 0.5hour`

Substituting the values in above formula,

`\text{ Average speed } = (2)/(0.5) = 4 \text{ kilometer per hour }`

Thus average speed is 4 kilometer per hour