Ram travelled from a place Z to P at an average speed of 130 km/h. He travelled the first 75% of the distance in two- third of the time and the rest at an average speed of X km/h. The value of $\frac{X}{2}$ is:
Answer & explanation
Correct answer: option 2
Let total distance = A km/h
Time= \(\frac{A}{130}\) hours
75% of Distance = \(\frac{3}{4}\) × A
Time taken by him to cover 75% of distance = \(\frac{A}{130}\)×\(\frac{2}{3}\)
= \(\frac{A}{195}\)
Time taken to cover this left distance = \(\frac{A}{130}\) - \(\frac{A}{195}\)
= \(\frac{A}{390}\)
Remaining distance = A - \(\frac{3A}{4}\) = \(\frac{A}{4}\)
According to question ,
X = \(\frac{A}{4}\) × \(\frac{A}{390}\)
X = 97.5
Now ,
\(\frac{X}{2}\) = 48.75km