Correct option is C
Distance between starting points = 150 km.
Journey of first bus = 25 km, then takes a right turn and then runs for 15 km, then turns left and runs for another 25 km and takes the direction back to reach the main road.
Journey of second bus = 35 km along the main road
Let first bus started from point X.
After running for 25 km, it reaches point A.
=>Then took a right turn and then runs for 15 km.
=> After reaching point B, turns left and runs parallel to main road for another 25 km.
After reaching point C, takes the left turn and reached the main road at point D.
Total distance covered by the first bus along main road = 25 + 25 = 50 km
Let second bus started from point Y.
=> Due to a minor breakdown, the second bus has run only 35 km along the main road and reached point E
Total distance covered by the second bus along main road = 35 km
Distance between both the buses = 150 - (50 + 35)
=> 150 - 85
=> 65 km
The distance between the two buses at the end is 65 km.