A girl goes to school at a speed of 6 km/hr. She comes back with a speed of 18 km/hr. Find her average speed for the whole journey.
A11 km/h
B9 km/h
C10 km/h
D4 km/h
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ഒരു തവള 20 അടി ഉയരമുള്ള ഒരു മതിലിനു മുകളിൽ എത്താൻ ശ്രമിക്കുന്നു ഓരോ മണിക്കൂറിലും 3 അടി മുകളിലേക്ക് ചാടികയറുമെങ്കിലും രണ്ടടി താഴേക്ക് പോരും എങ്കിൽ മതിലിനു മുകളിൽ എത്താൻ തവളയ്ക്ക് എത്ര സമയം വേണ്ടിവരും ?
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