Kangaroo

Kangaroo do 10 jumps in 1 minute and then three minutes lie , then will make 10 jumps in 1 minute and 3 minutes lie, and so on. Find the shortest time in which kangaroo do 30 jumps.

Result

t =  9 min

Solution:

Solution in text t =

Try another example






Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):

Showing 0 comments:
1st comment
Be the first to comment!
avatar




To solve this example are needed these knowledge from mathematics:

Next similar examples:

  1. Ton's teeth
    teeth Calculate at what age homeless Anton will toothless. At age 29 has 26 teeth and each year next one tooth broke.
  2. Multiples
    numbers2_7 Find all multiples of 10 that are larger than 136 and smaller than 214.
  3. Swallows
    vtak 7 swallows 8 tits and 8 sparrows sitting on a wire. How many total flyoff bird sitting on a wire?
  4. Zucchini
    cukety One zucchini costs 5 CZK. How much would cost four?
  5. Annie
    dukatove_buchticky Annie had a few cents in wallet. She bought a 3 buns for 9 cents. Now she has 58 cents in the wallet. How many cents previously Annie had in the wallet?
  6. Bus
    Autobus At the A bus stop boarded 6 people into the bus and on each other bus stop one man more than the previous one. On E station never boarded. Stops are A, B, C, D, E. Calculate the number of people on the bus after leaving the station E.
  7. Winnie
    bears Winnie Hugo had the right paw 10 punches and on 15 left more. How many punches has on left paw?
  8. Number
    numbers_10 Which number is 17 times larger than the number 6?
  9. Shoes
    obuv Joseph had one pair of sandals, one pair of hiking shoes, 1 pair of botas, one pair of church shoes. How many pieces of shoes had together?
  10. CDs
    CDs Adam has 9 CDs more than Filip and 10 CDs less than Dominica. Filip has 7 CDs. How many CDs has Adam and how many CDs has Dominika?
  11. Answer
    juice Mam used 9 red, 9 green apples and 3 pears to prepare juice. How many pieces of fruit used by mom to prepare this juice?
  12. Gingerbread
    honey_cakes John decorated 27 gingerbread and Annie 7 more. How many gingerbread decorated Annie?
  13. Rolls
    rozky_2 Mom every day buys 6 rolls. On Friday buys 2 times as much. How many rolls buys on Friday?
  14. Trees
    hrusky_7 In the orchard, 38 apple trees and 20 pear trees grew. How many trees there grow?
  15. The school
    children_21 The school has 268 boys. Girls are 60 more than boys. How many children are there at school?
  16. Holidays
    holidays Calculate how many hours take holidays, if take 7 weeks.
  17. Flowers & garden
    flowers_2 The garden grows 5 white flowers. Yellow 7 more than white. Blue 4 fewer than yellow. How many flowers grow together in the garden?