(A) 116 km
(B) 147 km
(C) 240 km
(D) 580 km
Correct Option is: D
Distance travelled in 1ST hour =55 km
Speed of the van increases by 5 kmph after every one hour. Hence,
distance travelled in 2nd hour =60 km
distance travelled in 3rd hour =65 km
and so on
Total distance travelled
=(55+60+……..+(8 terms))
=8/2(2*55+(8-1)5)
=4(110+35)
=580km