A 380-metre-long train running at a speed of 80 kmph will take how much time to cross another 420-metrelong train running in opposite direction at a speed of 48 kmph?
A. 20.12 seconds
B. 22.5 seconds
C. 20.5 seconds
D. 18.57 seconds
How many kilograms, of sugar at Rs.42 per kg should a man mix with another 25 kg of sugar at Rs.28 per kg so that he may gain 25% profit by selling Rs.40 per kg?
A. 8 kg
B. 15 kg
C. 20 kg
D. 10 kg
A number X is increased by 20% to get another number Y. A third number Z is obtained by increasing Y by 10%. By what per cent should Z be decreased to get X?
Z can do a piece of work in 42 days. Y can do the same piece of work in 36 days. W can do it in 56 days. Z worked for 18 days and handed it to Y, who worked for 9 days and left the job for W. How many days will W take to finish the work?
A. 16 days
B. 20 days
C. 24 days
D. 18 days
Munsi Premchand sold a cow at a loss of 15%. Had he sold it for `300 more he would have earned a profit of 10% instead of loss. Find the cost price of the cow.
Answers & Solutions
Answer : Option C
Reqd time = $Length of train A + Length of train Bover Speed of train A + Speed of train B$
= $800 times 18 over 128 times 5$
= 22.5 seconds
Answer : Option D
Selling price of 1 kg mixture = Rs.40 per kg profit = 25%
Cost price of 1 kg mixture = 40 x $100 over 125$ = Rs. 32 per kg