A car can finish a certain journey in 10...

A car can finish a certain journey in 10 hours at a speed of 42 kmph. In order to cover the same distance in 7 hours? the speed of the car (km/h) must be increased by:
एक कार एक निश्चित दूरी 42 किमी/घण्टा की दर से 10 घण्टे में पूरी करती है। उसी दूरी को 7 घण्टे में तय करने के लिए कार की गति में किंतने किमी/घण्टे की वृद्धि आवश्यक है?

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A car can cover a distance of 420 km in 7 hours. How much speed should be increased to cover this distance in 6 hours ? कोई कार 7 h में 420 km की दूरी तय कर सकती है | दूरी को 6 h में तय करने के लिए गति कितनी बढ़ानी होगी?

A car is running at a speed of 64 km/h to cover a certain distance in 40 min. At what speed should the car run to reduce the time of the journey to 30 min? 40 मिनट में एक निश्चित दूरी तय करने के लिए एक कार 64 किमी/घंटा की चाल से चल रही है। यात्रा के समय को 30 मिनट कम करने के लिए कार को किस चाल से चलना चाहिए?

A boat covered a distance of 15 km upstream in 5 hours and a distance of 42 km downstream in 6 hours. The speed of the stream in km/h is: एक नाव धारा के विपरीत 15 किमी की दूरी 5 घंटे में और धारा के साथ 42 किमी, 6 घंटे में दुरी तय किया। किमी / घंटा में धारा की गति है:

A takes 30 minutes more than B to cover a distance of 15 km at a certain speed. But if A doubles his speed, he takes one hour less than B to cover the same distance. What is the speed (in km/h) of B? A को एक निश्चित चाल से 15 किमी की दूरी तय करने में B से 30 मिनट अधिक लगते हैं | लेकिन यदि A अपनी चाल दोगुनी कर ले, तो उसे इसी दूरी को तय करने में B से एक घंटा कम लगेगा |B की चाल ( किमी/घंटा में ) ज्ञात करें |

A train covers a certain distance in 45 minutes. If its speed is reduced by 5 km/h, it takes 3 minutes more to cover the same distance. The distance (in km) is: एक ट्रेन कोई निश्चित दूरी 45 मिनट में तय करती है | यदि इसकी चाल 5 किमी/घंटा से कम कर दी जाए, तो इसे यह दूरी तय करने में 3 मिनट अधिक लगेंगे | यह दूरी है -

A car covers 25 km at a uniform speed. If the speed had been 8 km/h more, it would have taken 10 hours less for the same journey. What is the speed of the car (in km/h)? कोई कार एक समान गति से 25 km की दूरी तय करती है| अगर गति 8 km/h अधिक होती, तो उसी यात्रा में 10 घंटे कम लगते हैं| कार की गति (km/h में) कितनी है?

A person travels a certain distance at a speed of 18 km/h and returns to the starting point at 12 km/h. If he takes 2 hours 55 minutes for the whole journey, the distance one way is: एक व्यक्ति कोई निश्चित दूरी 18 किमी/घंटा की चाल से तय करता है और आरंभिक बिंदु पर 12 किमी/घंटा की चाल से वापस आता है | यदि पूरी यात्रा में उसे 2 घंटे 55 मिनट लगते हैं, तो एक तरफ की दूरी है :

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