Capgemini Company Numerical Ability Simple & Compound Interest

Did any one got the referal drive call Letter. plz post if any one got it@hyd??

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Capgemini Other Question

A river runs at 4 km/hr. if the time taken by a man to row is boat upstream is 3 as the time taken by him to row it downstream then find the speed of the boat in still water.
Q 1. A, B, C are running in the same direction around a circular track. The track is marked with numbers from 1 to 12, like the dial of a clock. The 12 numbers are uniformly spaced along the track. A overtakes B once at 5 and then the next time again at 9. A overtakes C once at 2 and then the next time again at 4. What is the ratio of B's speed to C's speed?

A. 7:4

B. 2:1

C. 3:2

D. 5:4