A train runs for 3 hr at the speed of 40 Km/hr and then for \( 4\frac{1}{2}h\) at the speed of 60 Km/hr. Thus it covers 3/5 th part of the whole distance. It wants to cover the remaining distance in 4 h, find the average speed of the train for remaining distance.

A) 45 Km/hr

B) 35 Km/hr

C) 80 Km/hr

D) 65 Km/hr

Correct Answer:

D) 65 Km/hr

Description for Correct answer:

Let total distance = x
Now, according to the question,
\( 40 \Large \times 3 + 60 \times 4.5 = \frac{3x}{5} \)