Robert is travelling on his cycle and has calculated to reach point A at 2 P.M. if he travels at 10 kmph, he will reach there at 12 noon if he travels at 15 kmph. At what speed must he travel to reach A at 1 P.M.?
A. 9 km/hour
B. 10 km/hour
C. 11 km/hour
D. 12 km/hour
Correct Answer : D.
We need to calculate the distance, then we can calculate the time and finally our answer. Lets solve this, Let the distance travelled by x km Time = Distance/Speed
So 2 P.M. - 6 = 8 A.M Robert starts at 8 A.M. He have to reach at 1 P.M. i.e, in 5 hours So, Speed = 60/5 = 12 km/hr