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sneha 10 years ago

After robbing a bank, a thief runs and has a 200m start over the police. If the police runs

at 2 km/hr faster than the thief, after how much time police will be able to catch the thief?

Reply Like? Yes (1) | No

kriti kankariya 10 years ago

relative distance = 200m
relative speed = 2km/h = 2*10/36 m/s
time taken to catch = 200/(20/36) = 200*36/20 = 360sec = 6min

Like? Yes (2) | No

sneha 10 years ago

After robbing a bank, a thief runs and has a 200m start over the police. If the police runs

at 2 km/hr faster than the thief, after how much time police will be able to catch the thief?

Reply Like? Yes (1) | No

neha gupta 10 years ago

Let the distance travelled by thief before being caught be x km
speed of theif = y km/hr
time = x/y ...............(i)
then distance of police = (x + 0.2) km
speed of police = (y + 2) km/hr
time = (x + 0.2)/(y + 2) ..................(ii)
putting (i) and (ii) equal, we get
x/y = (x + 0.2)/(y + 2)
x/y = 0.1 hr = 0.1 * 60 = 6 minutes.

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sneha 10 years ago

If we permute 5 letters of the word ‘mango’. The number of permuted words with ‘n’ at the second place are :
a.5

Reply Like? Yes (4) | No (2)

sneha 10 years ago

23. On selling a bat at 5/7th of its marked price, the store earns 15% profit. What is the profit earned if it is sold at marked price?

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Devendra Marghade 10 years ago

61%

If marked price=x, then 5x/7 is 115% of the actual cost,so x=115*x/(5x/7)=161 of the actual cost.
Hence profit earned=61%.

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sneha 10 years ago

salim couldnt make it to the party as he ________to finish his assignment

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dharmender poonia 10 years ago

from my point of view it will be right.

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sneha 10 years ago

An intern can do a job in 15 days. The manger and senior manager are busy with other priorities and thus take 25 and 40 days respectively to complete the task. How long will they take to finish the task if all of them work together?
Read more at http://www.m4maths.com/user-profile.php?UID=242953#qFM06001uAqk1bU0.99

Reply Like? Yes | No

sneha 10 years ago

Reply Like? Yes (49) | No (5)

Devendra Marghade 10 years ago

7 & 47/79 days

Working together their 1 day work=(1/15)+(1/25)+(1/40)=79/600
So they will finish the work in 600/79 or 7 47/79 days

Like? Yes (16) | No (4)

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