Science, asked by harshvardhan2099, 19 days ago

If a train travels at 60 km / h for the first 40 minutes and 90 km / h for the next 20 minutes, what is the average speed of the train?

Answers

Answered by daughertyzoe
0

Answer:

How to calculate average speed. Speed is distance divided by time. Simply put, if you drove 60 kilometres for one hour, it would look like this: Speed = distance (60 km) / time (1 hour) = 60km/h.

Explanation:

To be honest im not sure i hope this helps

Answered by Player71
0

Answer:

average speed of train is 53.3 km/hr

Explanation:

train has a speed of 60km/h for the first 40 minutes,

t₁ = 40 minutes

  = \frac{2}{3} of an hour

v₁ = 60km/h

Distance covered by the train, d₁ = v₁t₁

d₁ = 60 x \frac{2}{3}

   = 40 km

for the next 20 minutes, train has the speed of 90km/h

v₂ = 40km/h

t₂  = \frac{1}{3} of an hour

d₂ = v₂t₂

    = 40 x \frac{1}{3}

    = 13.3 km

Total distance , d = d₁ + d₂

d =  40 km + 13.3 km

d = 53.3 km

Total time, t = t₁ + t₂

t = 40 mins + 20 mins

t = 60 mins = 1 hour

Average speed, V avg = \frac{d}{t}

= \frac{53.3 km}{1 hr}

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