1) The speed of boat in still water is 15 km/h and the rate of current is 13 km/h. Find the distance travelled downstream in 15 min. A) 5 km B) 6 km C) 7 km D) 8 km E) 9 km Answer: Option CExplanation:Distance in downstream = Downstream rate $\times$ time = $(15+13)\times\frac{15}{60}$ = 7 km/h
