SSC Math Question

The speed of motorboat in still water is 45 km/h. If it takes 1 hour 20 minute in covering 80 km in downstream, how long time taken by it in covering same distance in upstream case ?

(a) 3 h

(b) 1 h 20 min

(c) 2 h 40 min

(d) 2 h 55 min

Asked on March 29, 2017 in Math.
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  • 2 Answer(s)

    Solution : –

    downstream speed of motorboat = 80 * 3/4 = 60 km/h
    speed of stream = 60-45 =15 km/h
    upstream speed of motorboat = 45 -15 = 30 km/h
    required time = 80/30 hours
    = 2 h 40 min
    
    Answered on March 29, 2017.
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