Michael is a bicycle commuter. he has observed that the reduces the time for his 9 km commute by 15 min when he increases his average speed by 3 km/h. what is Michael's faster speed?
Let Michael's slower speed. Then his faster speed will be
When Michael travels with slower speed his time is
When Michael travels with faster speed his time is
Michael reduces the time for his 9 km commute by 15 min
Since we take
Therefore Michael's faster speed is km/h.