In the above question if the total time taken by the
train is 25 hours, what is the distance between these
two places?
(a) 1365.5 km
(b) 1369 km
(c) 1200 km
(d) Can't be determined
Answers
Answer:
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Step-by-step explanation:
to answr the question without attaching we cannot answer the question
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Answer:
Distance between two stations A and B is 778 km. A train covers the journey from A to B at 84 km per hour and returns back to A with a uniform speed of 56km per hour. Find the average speed of the train during the whole journey?
A. 69.0 km /hr
B. 69.2 km /hr
C. 67.2 km /hr
D. 67.0 km /hr
Step-by-step explanation:
Here is the answer and explanation
Answer : Option C
Explanation :
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Solution 1
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If a car covers a certain distance at x
kmph and an equal distance at y kmph. Then,
average speed of the whole journey = 2xyx+y kmph.
By using the same formula, we can find out the average speed quickly.
Average speed = 2×84×5684+56=2×84×56140=2×21×5635
=2×3×565=3365=67.2
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Solution 2
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Though it is a good idea to solve the problems quickly using formulas, you should know the fundamentals too. Let's see how we can solve this problems using basics.
Let the distance between A and B = x
Train travels from A to B at 84 km per hour
Total time taken for traveling from A to B = distancespeed=x84
Train travels from B to A at 56 km per hour
Total time taken for traveling from B to A = distancespeed=x56
Total distance travelled = x+x=2x
Total time taken = x84+x56
Average speed = Total distance traveledTotal time taken=2xx84+x56
=2184+156=2×84×5656+84=2×84×56140 =2×21×5635=2×3×565=3365=67.2