| A 260 m long train crosses a platform thrice its length in 80 s. What is the speed of the train in km/h? |
A) 52.4
B) 46.8
C) 35.1
D) Cannot be determined
E) None of the above
Correct Answer: C
Solution :
| Length of the train = 260 m |
| Then, length of the platform \[=260\times 3\] |
| \[=780\,m=0.78\,km\] |
| \[\therefore \] \[\text{Speed}\,\,\text{=}\,\,\frac{\text{Distance}\,\text{(length)}}{\text{Time}}=\,\,\frac{0.78km}{\frac{80}{60\times 60}h}\] |
| \[=\frac{0.78\times 60\times 60}{80}=35.1\,km/h\] |
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