Multiple choice

The speed of boat itself is 18km./hr. How much distance will it cover against the current of speed 3km./hr. in the same time in which boat covers 120 km. with the stream of speed 2km/hr?

  1. 75

  2. 80

  3. 90

  4. 96

  5. 108

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Downstream speed = 18 + 2 = 20 km/hr. Time taken for 120 km downstream = 120/20 = 6 hours. Upstream speed = 18 - 3 = 15 km/hr. In the same 6 hours, upstream distance = 15 × 6 = 90 km.