Question

Distance travelled is 360 km/hr and time taken is 4 hours 30 minutes. What is the average speed? *​

Answer 1

Answer:

80km/hr

Step-by-step explanation:

total distance=360 km/hr

total time=4 hours 30 min =4+1/2 hr

  avg .speed=total distance/total time

                    =360/4+1/2

                    =360*2/9

                   =40*2

                   =80km/hr.

Answer 2

Answer:

The average speed is $80$ km/hr.

Step-by-step explanation:

$60$ seconds = $1$ minute

$60$ minutes = $1$  hour

$1$ minute = $\frac{1}{60}$ hour

Also, recall the definition of the average speed,

Average speed is the total distance travelled in an particular time by an object, i.e.,

$v=\frac{d}{t}$,

where $v=$ average speed, $d=$ total distance travelled and $t=$ time taken

According to the question,

Total distance travelled = $360$ km

Total time taken = $4$ hours $30$ minutes

             (in hour) = $4$ hours + $\frac{30}{60}$ hour  (Since $1$ minute = $\frac{1}{60}$ hour)

                           = $4$ hours + $\frac{1}{2}$ hour

                           = $4$ hours + $0.5$ hour

                            = $4.5$ hour

Now,

Average speed = $\frac{Total\ distance\ travelled}{Total\ time\ taken}$

                          = $\frac{360}{4.5}$

                          = $\frac{360\times10}{45}$

                          = $80$ km/hr

Therefore, the average speed is $80$ km/hr.

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