issb mathematics MCQ #658

Boat 10 km/h in still water, stream 3 km/h. Downstream speed?

issb mathematics MCQ #658

  1. Question 1

    Q1. Boat 10 km/h in still water, stream 3 km/h. Downstream speed?

    • A) 7 km/h
    • B) 10 km/h
    • C) 13 km/h
    • D) 30 km/h

    Answer: 13 km/h

    Explanation: Downstream speed is boat plus stream so 13 km/h. Work each step carefully; ISSB math rewards accuracy under time pressure.