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Time Distance and Speed
If a student decrease his speed by 25% of original seed, he reach school 8 minute late. What is his usual time of reaching school (in minutes)? (A) 28 (B) 30 (C) 20 (D) 24 (E) 32
Read Solution (Total 4)
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- as we know the speed of student is decreased by 25%
so,
Speed left = (overall speed -decreased speed)/(overallspeed)
speed left = 75/100 =3/4.
speed is inversely proportional to time it means, S =1/T
then
3/4s =4/3t
so,
from above question
4t/3-t = 8/60
t=2/5
t= 2/5*60 = 24MINUATEs
hence answer is 24 minuates - 5 years agoHelpfull: Yes(7) No(1)
- 100t=75t(t-8)
t=24 - 5 years agoHelpfull: Yes(3) No(1)
- If he decrases 25% i was 8 minutes lates then in 25 minutes he will walk 8 then for 100 it wiil be 8*4=32
- 6 years agoHelpfull: Yes(2) No(4)
- st=s*(75/100)(t+8)
t=3/4(t+8)
4t=3t+24
t=24 min - 5 years agoHelpfull: Yes(2) No(0)
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