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Q:

A man covers a distance of 1200 km in 70 days resting 9 hours a day, if he rests 10 hours a day and walks with speed 1½ times of the previous in how many days will he cover 840 km ?

A) 39 days B) 37 days
C) 35 days D) 33 days

Answer:   C) 35 days



Explanation:

Distance d = 1200km
let S be the speed

he walks 15 hours a day(i.e 24 - 9)
so totally he walks for 70 x 15 = 1050hrs.

S = 1200/1050 => 120/105 = 24/21 => 8/7kmph


given 1 1/2 of previous speed
so 3/2 * 8/7= 24/14 = 12/7

New speed = 12/7kmph

Now he rests 10 hrs a day that means he walks 14 hrs a day.

time = 840 x 7 /12 => 490 hrs
=> 490/14 = 35 days

So he will take 35 days to cover 840 km.

Q:

The ratio between the speeds of two trains is 2 : 5. If the first train runs 350 km in 5 h, then the difference between the speeds (in km/h) of both the trains is:

 

A) 350 B) 105
C) 165 D) 180
 
Answer & Explanation Answer: B) 105

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2 294
Q:

Given that the lengths of the paths of a ball thrown with different speeds by two boy sare the same, if they take 0.6 seconds and 1 second respectively to cover the said length, what is the average speed of travel for the first throw, if the same for the second is 96 km/h?

A) 160 km/h B) 200 km/h
C) 150 km/h D) 100 km/h
 
Answer & Explanation Answer: A) 160 km/h

Explanation:
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1 325
Q:

A man divided his journey into three parts of distances of 18 km, 20 km and 27 km. He travelled the distances at the speeds of 6 km/h, 5 km/h and 9 kn/h,respectively. What was his average speed during the entire journey?

 

A) 6.5 km/h B) 4.5 km/h
C) 7.5 km/h D) 5.5 km/h
 
Answer & Explanation Answer: A) 6.5 km/h

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2 584
Q:

The distance between two railway stations is 1176 km. To cover this distance, an express train takes 5 hours less than a passenger train while the average speed of the passenger train is 70 km/h less than that of the express train. The time taken by the passenger train to complete the travel is:

 

A) 12 hours B) 23 hours
C) 17 hours D) 18 hours
 
Answer & Explanation Answer: A) 12 hours

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2 664
Q:

The distance between the places H and O is D units. The average speed that gets a person from H to O in a stipulated time is S units. He takes 20 minutes more time than usual if he travels at 60 km/h, and reaches 44 minutes early if he travels at 75 km/h. The sum of the numerical values of D and S is:

 

A) 376 B) 358
C) 344 D) 384
 
Answer & Explanation Answer: D) 384

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0 416
Q:

A train that is running at the speed of 72 km/h crossesan electric pole in 36 seconds. The length of the train (in metres) is:

 

A) 720 m B) 460 m
C) 360 m D) 620 m
 
Answer & Explanation Answer: A) 720 m

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1 463
Q:

An athlete crosses a distance of 900 m in 10 minutes. What is his speed in km per hour?

 

A) 5.4 km/h B) 6.9 km/h
C) 3.6 km/h D) 4.8 km/h
 
Answer & Explanation Answer: A) 5.4 km/h

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2 3512
Q:

Rakesh walking at the speed of 8 km/h crosses a bridge in 30 minutes. What is the length of the bridge in kilometres?

 

A) 5 km B) 2 km
C) 3 km D) 4 km
 
Answer & Explanation Answer: D) 4 km

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2 556