A train travels from Station 'A' to Station 'Z'. If it does
not stop at any station between Stations 'A' and 'Z',
then it completes its journey at a speed of 80 km/h.
However, if it stops at all the stations between
Stations 'A' and 'Z', then it completes its journey at a
speed of 52 km/h. For how many minutes does the
train stop per hour?
19
24
23
21
Answers
Answer:
hello dear friend hope it help you xd
Step-by-step explanation:
2 ways to get ans quickly
Given : A train travels from Station 'A' to Station 'Z'. If it does
not stop at any station between Stations 'A' and 'Z',
then it completes its journey at a speed of 80 km/h.
if it stops at all the stations between Stations 'A' and 'Z', then it completes its journey at a speed of 52 km/h
To find : For how many minutes does the train stop per hour
Solution:
Let say Distance = D km
Speed 80 km/hr
Time taken = D/80 hrs
Speed 52 km/hr
Time taken = D/52 hrs
Extra time taken = D/52 - D/80
= ( 20 - 13) D / 1040
= 7D/1040 hrs
(7D/1040) / (D/52)
= 7/20 hrs
= 7 * 60/20 mins
= 21 mins
train stop per hour = 21 mins
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