on a 60 km track,a train travels the first 30 km with a uniform speed of 30 km per hour .how fast must the train travel the next 30 km so as its average speed will be 40km per hour for the entire trip?
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Explanation:
answer is 60 km/hr. hope it helps u.
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Answered by
8
Answer:
60 km/hr
Explanation:
Time taken to travel 1st 30 km = dist/speed = 30/30 = 1 hr
let it travels with vkm/hr for next 30 km , time taken= 30/v
Average speed= total dist/ total time
= (30+30)/(1+ 30/v) = 40 (given)
Rearranging 1 + 30/v = 60/40
30/v = 3/2- 1= 1/2
hence v= 30*2 = 60km/hr
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