A frog starts climbing 15 feet wall. Each hour he climbs 3 feet and rests for 30 minutes. During rest, he slips back 2 feet. How many hours does the frog take to reach the top.

a) 19 hrs
b) 19.5 hrs
c) 20 hrs
d) 21 hrs

• ans is 19 hr
• 10 years agoHelpfull: Yes(26) No(8)
• ans is 19
  after 18 hours 12 steps and next hour he reaches 15
• 10 years agoHelpfull: Yes(16) No(1)
• 19hrs
  1 ft in 1.5 hrs
  then 12 ft in 18 hrs
  n in the next hr he goes 3 mr ft ie 15 ft.
  hence 19 hrs
• 10 years agoHelpfull: Yes(9) No(1)
• frog climbs 3 feet/hr and in next 30 min slips 2 feet. so the frog net (3-2)feet climbs .i.e 1 feet climb in 1.30 hr. to reach to the top of the wall,needs 15 jumps.and each jumps takes 1.30 hr. so total time taken is=15*1.30hr=19.5 hrs
• 10 years agoHelpfull: Yes(4) No(17)
• THE CORRECT ANSWER IS 19 HOURS.
  for one feet(3-2 feet=1 feet) it takes 1.5 hours
  so for 12 ft, = 12*1.5 = 18 hours and during the next hour it climbs 3 ft. so ans will be (12+3= 15 ft) in 18+1= 19 hrs and after that ly it will fall down 2 feet while resting, so that need not be taken into account. as in 19 hrs it will be at 15 feet frm bottom.
• 10 years agoHelpfull: Yes(2) No(0)
• ans: 19 hours
  
  solution: 1 hour =3 feet and in 50 min rest= -2 feet
  
  hence in 1.5 hours = 3 - 2= 1 feet
  
  now, for the starting 12 he needs 1.5 hrs per feet i.e.
  
  1.5 x 12 = 18 hours
  
  remaining 3 feet can be climbed only in 1 hour ( no need of rest and no slips occur when reached the top)
  
  hence, simply 18+1 = 19 hours.....
  
  got it or not
• 9 years agoHelpfull: Yes(2) No(0)
• ans: b) 19.5 hrs
  
  total wall len = 15,
  at each hour and next half hour frog dist= (3-2)=1
  so, every 1.5 hour 1 dist
  
  1.5*13=19.5 hrs
  at this stage
  frog goes 19.5 + 3 = 22.5 feet
  it reaches destination, so he can't sleep at last
  
• 10 years agoHelpfull: Yes(1) No(15)
• pls explain how it is 19hr???
  
• 10 years agoHelpfull: Yes(1) No(0)
• HUHGBBDBDSBDB DSGS
• 10 years agoHelpfull: Yes(1) No(0)
• @juhi rawat : wat is the correct answer??
• 10 years agoHelpfull: Yes(0) No(1)
• 1 feet in 1 and half hour till 12M and then after he climb 3M and finally reaches to top
• 9 years agoHelpfull: Yes(0) No(0)
• 19hrs after 18 hrs he will reach at 12 feet and next 1 hr he will reach at 15 feet after that he does not need to take rest (or claculation of rest)
• 1 year agoHelpfull: Yes(0) No(0)
• 19 hrs
  
  look 3 feet in 1 hrs
  
  so total hrs will be 15 hrs
  also he takes 30 min , of rest
  
  so he will take 4 rest to reach the top
  
  so 15 (hrs) +4 hrs (30 min +30min + 30min +30min) = 19 hrs
• 1 year agoHelpfull: Yes(0) No(0)