# 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

**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