Question

How long will it take if you travel 400km with an average speed of 100m/s

Answer 1

Answer:

The formula which relates distance d, time t, and speed or rate of travel r is:

d = rt.

We're given that the traveled distance d = 400 km and an average speed, r = 80 km/hr.

Substituting into the distance-rate-time formula for d and r to find the time t traveled , we get:

d = rt

400 km = (80 km/hr)t

Now, dividing both sides by 80 km/hr, we have:

(400 km)/(80 km/hr) = [(80 km/hr)/(80 km/hr)

[(400 km)/(80 km)]hr = [(80 km/hr)/(80 km/hr)]t

5 hr = [1]t

t = 5 hr is how long a trip will take in hours if you travel 400 km at an average speed of 80 km/hr.

or

At 80 km/h you’d travel 80 km in one hour.

After two hours at 80 km/h, you would travel 2 h * 80 km/h = 160 km.

After three hours at 80 km/h, you’d travel 3 * 80 = 160 km.

After N hours at 80 km/h, N * 80 km.

So, after 5 hours, the answer is: 5 * 80 = 400.

Explanation:

U can use any one

Answer 2

Given:

400 km is travelled with 100 m/s speed.

To find:

Time taken ?

Calculation:

• We know that : Average speed it is equal to the ratio of total distance and total time.

$\therefore \: avg. \: v = \dfrac{total \: distance}{total \: time}$

$\implies \: 100 \: m {s}^{ - 1} = \dfrac{400 \times {10}^{3} \: m }{total \: time}$

$\implies \:total \: time = \dfrac{400 \times {10}^{3} }{100}$

$\implies \:total \: time = 4000 \: sec$

$\implies \:total \: time = 4000/60 \: min$

$\implies \:total \: time = 66.67 \: min$

So, total time taken to travel 400 km is 66.67 minutes