Question
A man covers a distance of 20 km in 3.5 hours partly by running and partly by walking. If he walks at 4 kmph and runs at 10 kmph, find the distance he covers by walking.
Answer: Option A
LET THE DISTANCE COVERED BY WALKING BE X KM
THE DISTANCE COVERED BY RUNNING BE (20-X) KM TIME FOR WALKING + TIME FOR RUNNING = 3.5 HOURS (X/4)+[(20-X)/10]=3.5 SOLVING,
5X+40-2X = 70
3X=30
X=10KM
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LET THE DISTANCE COVERED BY WALKING BE X KM
THE DISTANCE COVERED BY RUNNING BE (20-X) KM TIME FOR WALKING + TIME FOR RUNNING = 3.5 HOURS (X/4)+[(20-X)/10]=3.5 SOLVING,
5X+40-2X = 70
3X=30
X=10KM
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