Question

If a train covers 200 km in 4 hrs, what is its speed ?

Answer 1

Answer:

Given that distance(d) = 200km, time(t) = 4hrs 20min

First convert time into hours

t = 4 + 20/60 = 4 + 1/3 = (12 + 1)/3 = 13/3 hrs

Then calculate Speed(v1)

v1 = d/t = 200/(13/3) = (200*3)/13 = (600/13) km/hr

Now speed increased by 18km/hr

v2 = v1 + 18 = (600/13) + 18 = (600 + 234)/13 = (834/13) km/hr

So Time(t2) = d/v2

t2 = 200 / (834/13) = (200 * 13) / 834 = 2600/834 hr

t2 = 3.117 hrs or 3hr 7min 1 sec

Ans: Time = 3.117 hrs or 3hr 7min 1 sec

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Answer 2

Answer:

Speed = distance / time

here distance is 200 km

time is 4 hrs

Speed is 200/4 = 50 km/h