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Question

Q. Sreya can cover a certain distance by walking in 8 hours with 21km/hr speed. Find her speed if she is running and take 6 hours to cover the same distance.

Q. श्रेया 21 किमी/घंटा की गति से 8 घंटे में पैदल चलकर एक निश्चित दूरी तय कर सकती है। यदि वह दौड़ कर 6 घंटे में उसी दूरी को तय कर ले तो उसकी गति ज्ञात करें।


A

25 km/hr
25 किमी/घंटा
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B

28 km/hr
28 किमी/घंटा
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C

24 km/hr
24 किमी/घंटा
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D

30 km/hr
30 किमी/घंटा
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Solution

The correct option is B
28 km/hr
28 किमी/घंटा

Since the distances are the same, time is inversely proportional to speed.

Time for walking : Time for running =8:6=4:3

So Speed while walking : Speed while running =3:4

34=21x where x is the speed while running

x=21×43=28 km/hr


चूँकि दूरियाँ समान हैं, इसलिए समय चाल के व्युत्क्रमानुपाती है।

पैदल चलने में लिया गया समय : दौड़ने में लिया गया समय =8:6=4:3

इसलिए, पैदल चलते समय चाल : दौड़ते चलते समय चाल =3:4

34=21x जहाँ x दौड़ते समय चाल है

x=21×43=28 किमी/घंटा


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