1. 

A car and a bus start from city A at the same time. How far is the city B from city A ?

I. The car travelling at an average speed of 40 km / hr reaches city B at 4:35 p.m.

II. The bus reaches city B at 6:15 p.m. at an average speed of 60 km / hr.

A. I alone sufficient while II alone not sufficient to answer
B. II alone sufficient while I alone not sufficient to answer
C. Either I or II alone sufficient to answer
D. Both I and II are not sufficient to answer
E. Both I and II are necessary to answer

Answer: Option E

Explanation:

Let AB = X km. From I and II, we get :

[(6:15 p.m.) - (4:35 p.m.) = 1 hr 40 min]

X/40 - X/60 = 1(40/60) hrs
<=> X/40 - X/60 = 100/60 .
This gives X.

∴ Correct answer is (E).