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Let the distance travelled by a man be D km According to the question, Total time taken = 2 hrs 30 min = 3(30/60) = 7/2 hours Total time = T1 + T2 D/20 + D/15 = 7/2 (3D + 4D)/60 = 7/2 7D/60 = 7/2 D = 30 km
The average of marks obtained by 50 candidates was 56. If the average of the passed candidates was 60 and that of the failed candidates was 50, then th...
There are three numbers such that when the average of any of the two numbers is added with the third number, sum obtained will be 130, 142 and 154. Find...
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Average run scored by a batsman in 14 innings is 80. In next 6 innings, he scored runs with an average of ‘x’ so that his overall average increases ...
The average marks scored by 20 boys and 45 girls are 88 and 94 respectively. Find the average marks scored by all the students together. (Answer should ...
The average weight of 8 persons increased by 1.5 kg when a person weighing 65 kg is replaced by a new person. What could be the weight of a new person?
The average salary of A, B and C is Rs. 22000 while average salary of B, C and D is Rs. 25000. If the average salary of D be 2 times of that of A, then...
The average cost price of 15 pens (having equal cost price) decreased by Rs.2, when one of the pen is replaced by a new pen having cost price of Rs.70. ...
