Question

A boy walking at a speed of 20 km/h reaches his school 30 min late. Next time he incre
speed by 4 km/h but still he is late by 10 min. Find the distance of the school from his
house​

Answer 1

Answer:

12km

Step-by-step explanation:

Let the distance of his school from the house be x

⇒  The difference in time =(30−10)min

                                           =20min

                                           =20/60hr

                                           =1/3​hr

⇒  Speed during next journey =20+4=24km/hr

According to the question,

⇒  x​/20−x​/24=1/3

⇒  10x​/120−5x/120​=1/3

⇒  5x​/120=1/3

⇒  x​=(1​/3)*(120/5)

⇒  x = 12

∴  x=12km

∴   The distance of boy school from house is 12km

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