Question

A boy leaves his house at 9:38 am for his school. The school is 2km away and classes start at 10:00 a.m. If he walks at a speed of 3km/hr for the first kilometre, at what speed should he walk the second kilometre to reach just in time.​

Answer 1

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• total time =10.00am-9.38am=22minutes

now ....

total distance=2km

case 1

speed =3km/hr

distance=1km

time=(1/3)hr=20minutes

• therefore remaining time =(22-20) minutes=2minutes
• remaining distance=(2-1)km=1 km

case 2

time=2min=(1/30)hr

distance =1km

therefore...........

speed

$= \frac{1}{ \frac{1}{30} } \: km.h {}^{ - 1} \\ = 30 \: km.h {}^{ - 1}$

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• So the second km should be walked at a speed of 30 km/hr. to reach in time to school.........✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨✨

Answer 2

Answer:

hi mates this is ur answer

Explanation:

case 1

speed =3km/hr

distance=1km

time=(1/3)hr=20minutes

therefore remaining time =(22-20) minutes=2minutes

remaining distance=(2-1)km=1 km

case 2

time=2min=(1/30)hr

distance =1km

therefore...........

speed= 1/1/30km.h

= 30 km.h

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