self Maths Puzzle

A person covers 800km partly at a speed of 50kmph and partly at a speed of 150kmph, in 10 hours over all. What is the distance covered at the speeds of 150 kmph?

Read Solution (Total 1)

average speed= 800/10=80
ratio of distance covers at speed of 50km &150km= 7:3
distance covered at 150km=30/(7+3)*3= 9km
7 years agoHelpfull: Yes(0) No(6)

self Other Question

If the difference between a three digit number ABC and the number formed by reversing its digits is divisible by 7 then how many number of possible values of ABC exist?
The cost of oil is Rs.100 per kilogram. After adulteration with another oil, which costs Rs.50 per kilogram, Ram sells the mixture at Rs.96 per kilogram making a profit of 20%. In what rati does he mix the two kinds of oil?