A man takes half time in rowing a certain distance downstream than upstream | UPSC CSAT 2020 PYQ |

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[dann]

Thanks. You could have chosen S and C as letters to denote the speeds.

[nikhilguleria]

Ds= R+S= x/ t/2
R+S/2= x/t

Us= R-S= x/t

R+s/2 = R-S
r+s= 2r-2s
r=3s
r/s=3/1
3:1