Asked by Berry

A motorist does the first part of the journey at an average speed of 54 km/h. He then increases his speed to 60 km/h for the rest of the journey. if he travels 225 km in 4 hours, what is the distance traveled for the first part of his journey????
Answered by Reiny
time at slower speed --- x hrs
time at faster speed ---- 4-x hrs

54x + 60(4-x) = 225

solve for x, then evaluate 54x to find distance at slower speed
Answered by abah
a motorist travels regularly between two towns 5 hours when tralling at a certain speed. he finds that if he increases his average speed by 15 km/h the journey take 1 hour less find his usual speed
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