Three person are walking from place A to place B. There speeds are in ratio 2:3:5. The time ration to reach B by these three persons will be

Options
- 15:4:8
- 15:10:6
- 7:8:12
- 4:8:25

CORRECT ANSWER : 15:10:6

Discussion Board
Here we need to considered Speed is inversely Propostional to Time


let the distance be X
S = D/T
= X/2 : X/3 :X/5 {LCM OF 2,3,5 = 30}
AS WE KNOW Speed is inversely Propostional to Time
= 1/2*30 : 1/3*30 : 1/5*30
= 15 : 20 : 6

Prachi kakade 07-9-2020 02:11 PM

Answer

2:3:4
1/2:1/3:1/4 where speed = 1/time
lcm(2,3,4) = 30
1/2*30,1/3*30,1/5*30 = 15:10:6

Preethi 06-29-2020 07:58 AM

time speed distance

go through the options, see there in this case speed ratio is 2x:3x:5x
take x=10
20kmph
30kmph
50kmph
speed and time are indirectly proportional


ashwini 08-20-2019 11:52 AM

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