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.?
8 kmph
11 kmph
12 kmph
14 kmph
Explanation:
Let the distance travelled by x km.
=> x/10 - x/15 = 2
=> x=60
Time taken to travel 60 km at 10 km/hr. = 60/10 = 6hrs.
So, Robert started 6 hours before 2 P.M. i.e., at 8 A.M.
Hence, the Required speed = 60/5 = 12kmph.