113. A train covers the first 5 km of its journey at a
speed of 30 km/hr and the next 15 km at a
speed of 45 km/hr. What is the average speed
of the train ?
(a)
35 km/hr
(b)
37-5 km/hr
(e)
39-5 km/hr
(d)
40 km/hr
Answers
Answered by
1
Answer:
a
hope and will help you
Answered by
3
Step-by-step explanation:
Avg speed= Total distance/ total time
Total time to travel 1st 5 km
= 5/30 = 1/6 hour
time taken to travel next 15 km
= 15/45 = 1/3 hour
Now avg speed ={5+15} / {(1/3)+(1/6)}
= 40kmph
D is right answer
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