Robert is riding his bike and has calculated that he will arrive at point A at 2:00 p.m. If he goes at 10 kmph, he will arrive at 12 p.m. If he travels at 15 kmph, he will arrive at 12 p.m. How fast must he go to get to A by 1 p.m.?
A. 8 kmph
B. 11 kmph
C. 12 kmph
D. 14 kmph
Answer:C
Robert is riding his bike and has calculated that he will arrive at point A at 2:00 p.m. If he goes at 10 kmph, he will arrive at 12 p.m. If he travels at 15 kmph, he will arrive at 12 p.m. How fast must he go to get to A by 1 p.m.?
A. 8 kmph B. 11 kmph C. 12 kmph D. 14 kmph
Explanation: Increase the distance travelled by x kilometres.As a result, x/10 - x/15 = 2,60 = 3x - 2x,x is equal to 60 kilometres.Traveling 60 kilometres at a speed of 10 kilometres per hour takes 6 hours.As a result, Robert began 6 hours before 2 p.m., at 8 a.m.60/5 kmph = 12 kmph is the required speed.