Advertisements
Advertisements
Question
A car covers a distance in 40 minutes with an average speed of 60 km/h. What should be the average speed to cover the same distance in 25 minutes?
Advertisements
Solution
A car covers a distance in 40 min with an average speed = 60 km/h
= `(60 xx 1000)/60` m/min
In 1 min, the same distance can be cover with speed = `(60 xx 1000 xx 40)/60`
= 40000 m/min
In 25 min, the same distance can be cover with speed = `40000/25`
= 1600 m/min
= `1600/1000 xx 60` ...`[∵ 1m = 1/1000 km and 1 min = 1/60 h]`
= 16 × 6
= 96 km/h
APPEARS IN
RELATED QUESTIONS
A mixture of paint is prepared by mixing 1 part of red pigments with 8 parts of base. In the following table, find the parts of the base that need to be added.
| Parts of red pigment | 1 | 4 | 7 | 12 | 20 |
| parts of base | 8 | .... | .... | .... | .... |
68 boxes of a certain commodity require a shelf-length of 13.6 m. How many boxes of the same commodity would occupy a shelf length of 20.4 m?
Working 8 hours a day, Ashu can copy a book in 18 days. How many hours a day should he work so as to finish the work in 12 days?
A pipe can fill a cistern in 10 hours. Due to a leak in the bottom it is filled in 12 hours. When the cistern is full, in how much time will it be emptied by the leak?
A cistern has two inlets A and B which can fill it in 12 hours and 15 hours respectively. An outlet can empty the full cistern in 10 hours. If all the three pipes are opened together in the empty cistern, how much time will they take to fill the cistern completely?
If 600 rupees buy 15 bunches of feed, how many will 1280 rupees buy?
A birthday party is arranged in third floor of a hotel. 120 people take 8 trips in a lift to go to the party hall. If 12 trips were made how many people would have attended the party?
The number of teeth and the age of a person vary ______
If two quantities x and y vary directly with each other, then ______ of their corresponding values remains constant.
If 25 metres of cloth costs Rs 337.50, then what will be the cost of 40 metres of the same type of cloth?
