Question

Out of a distance of 80km, the first 60 km is covered at a speed of 40 km/h and the remaining distance at a speed of 20 km/h. Calculate the average speed. Do the conversions and the steps and get an answer 32 km/h.

I ONLY WANT THE STEPS SO DO NOT WRITE 32KM/H JUST LIKE THAT WITHOUT STEPS

Answer 1

Answer:

If in a total distance of 80 km, the first 60 km is traveled at speed of 40 km / hr and the next 20 km at a a speed of 20 km / hr, then the average speed is 32 km / hr

Step-by-step explanation:

Given

Total distance = 80 km

The speed at first 60 km =40 km/hr

That is, 40 km traveled in 1 hour

So, 1 km traveled in 1/40 hours

60 km traveled in :

$\frac{1}{40} *60 hr\\\\= \frac{3}{2} \\\\= 1.5$

So the time taken for traveling the first 60 km in 1.5 hours

The speed at the remaining 20 km is 20 km/hr

That is the 20 km is traveled in 1 hour

So, the time taken for traveling the remaining 20 km is 1 hour

Average speed = total distance traveled / total time taken

Total distance traveled = 80 km

Total time taken = 1.5 + 1 = 2.5 hours

So, average speed = 80/2.5 = 32 km/ hr

So the average speed is 32 km/ hr

Answer 2

Answer:

ans is 32 km per hour

Step-by-step explanation:

please refer to the attachment above