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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ഒരു വ്യക്തി 15 മണിക്കൂർ യാത്ര ചെയുന്നു. ആദ്യത്തെ അരമണിക്കൂറിൽ 21km ഉം രണ്ടാം അരമണിക്കൂറിൽ 24km ഉം സഞ്ചരിക്കുന്നു. ആ വ്യക്തി ആകെ എത്ര ദൂരം സഞ്ചരിച്ചു ?
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