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Tamanna goes Pune to Mumbai with 80 kmph and returns to pune with speed of 120 kmph.Find average speed?

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Two liquids a and b are in ratio 5:1 in container 1 and 1:3 in cont 2.In what ratio should contents of 2 containers be mixed so as to obtain a mixture of a and b in the ratio 1:1 Tamanna goes Pune to Mumbai with 40 kmph and returns to pune with speed of 20 kmph.Find average speed