A) 48
B) 50
C) 60
D) 72
Correct Answer: C
Solution :
Sol. [c] |
Let the person takes 3th to reach his destination with a speed of 40 km/h. |
\[\therefore \]Distance travelled \[=\,40\times 3\,=\,120km\] |
Now distance travelled in \[\frac{2}{3}\,(3\,t)\,h\,=\,60\,t\] |
\[\therefore \] Distance travelled in t hours finally |
\[=\,120\,t\,-\,60\,t\,=\,60\,t\,km\] |
\[Speed\,=\,\frac{Dis\tan ce}{Time}\,=\,\frac{60\,t}{t}\,=\,60km/h\] |
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