The speed of a boat in still water is 15 km/hr. It can go 30 km upstream and return down stream to the original point in 4 hrs and 30 minutes. Find the speed of the stream:
A4 km/hr
B8 km/hr
C4.5 km/hr
D5 km/hr
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നീലിമ സഞ്ചരിച്ച തീവണ്ടി 2 മണിക്കൂർ 30 മിനിട്ട് കൊണ്ട് 300 കി. മീ. ഓടിയാണ് കോഴിക്കോട് എത്തിയത്. തീവണ്ടിയുടെ ശരാശരി വേഗം എത്ര ? (മണിക്കൂറിൽ)