DSSSB · Mathematics

A tugboat covers a distance of 120 km from port A to port B in 10 hours upstream with a speed of 4 km/h. On return, she pulls a heavy barge, due to which her speed in still water is reduced by 25%. How much additional time did the round trip take compared to returning without the barge?

  1. 1.75 hours
  2. 1.50 hours
  3. 1.25 hours
  4. 2.25 hours
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