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Question

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.?

Options:
A .  8 kmph
B .  11 kmph
C .  12 kmph
D .  14 kmph
Answer: Option C

Let the distance travelled by x km.



Then,
x
-
x
= 2
10
15


Robert Is Travelling On His Cycle And Has Calculated To Reac... 3x - 2x = 60


Robert Is Travelling On His Cycle And Has Calculated To Reac... x = 60 km.



Time taken to travel 60 km at 10 km/hr =
Robert Is Travelling On His Cycle And Has Calculated To Reac...
60
Robert Is Travelling On His Cycle And Has Calculated To Reac...hrs
= 6 hrs.
10


So, Robert started 6 hours before 2 P.M. i.e., at 8 A.M.



Robert Is Travelling On His Cycle And Has Calculated To Reac... Required speed =
Robert Is Travelling On His Cycle And Has Calculated To Reac...
60
Robert Is Travelling On His Cycle And Has Calculated To Reac...kmph.
= 12 kmph.
5



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