With an average speed of 40 km/hr a car reaches its destination on time. If it goes with an average speed of 35 km/h, it is late by 15 minutes. The total journey is? Choose the correct answer:
A) 30 km B) 40 km C) 70 km D) 80 km E) 90 km
Let the total journey be X km.   X/35 - X/40 = 15/60   Solving for X, we get X = 70   Therefore, total journey = 70 km.   ANSWER:70 km
<result>C</result>
With an average speed of 40 km/hr a car reaches its destination on time. If it goes with an average speed of 35 km/h, it is late by 15 minutes. The total journey is?