A magician can reach his auditorium in 30 hours. If he reduces his speed by 1/15th, he goes 10 km less in that time. Find his speed

Options
- 10 kmph
- 12 kmph
- 15 kmph
- 20 kmph


CORRECT ANSWER : 15 kmph

Discussion Board
Make equation first

Since, D1 - D2 = 10km. (Due to difference in speed)
Therefore, S*T - S*T =10 km
Let speed =x
30x - 30(x-x/15)=10km
30x-30(15x-x/15)=10
30x-2(14x)=10
30x-28x =10
2x =10
Therefore,x=5kmph

Smit shah 03-2-2021 09:37 AM

answer breakup

s = d/t ----------1
(14/15)s = d-10/t ----------- 2
substitute 1 in 2 or divide 1 by 2, both ways we get
14d = 15(d -10)
d = 150
s = 150/30 = 5

Vinay 02-18-2021 05:28 AM

solution

Ratio of speed = 15 : 14
Ratio of time = 14 : 15
14 = 28 hrs
15 = 30 hrs
So, in 2 hrs it travels 10 kms
Speed = 10/2 = 5 km/hr

himanshu 09-25-2019 07:40 AM

Help

Please show the solution

Vaishali 06-15-2019 12:51 PM

Help

Can someone show the solutions??

Yeshi 07-24-2018 02:10 AM

answer given are wrong

first check given answer. Than upload details . answer is 5km/hr

lee 12-21-2016 09:57 PM

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