A runs twice as fast as B and gives B a start of 50m.How long should the racecourse be so that A and B might reach in the same time?

a) 75 m.
b) 80 m.
c) 150 m.
d) 100 m.
e) None of the above

• ratio of speeds of a and b is 2:1
  b is 50m away from a but we know that a covers 1 meter(2-1) more in every second than b
  the time taken for a to cover 50m is 50/1=50m
  so the total time taken by a and b to reach =2*50=100m
  ans:100m
• 8 years agoHelpfull: Yes(4) No(1)
• x(n/n-1) =>50(2/2-1) =>100 is the ans
• 8 years agoHelpfull: Yes(0) No(0)