12. A journey takes 4 hours 30 minutes at a speed of 60 km/h. How long will the same
journey take at a speed of 15 m/sec
Answers
Answered by
1
Answer:
4 hours 30 minutes = 4.5 hours.
Step-by-step explanation
A journey takes 4 hours 30 minutes at a speed of 60 km/hr. If the speed is 15 m/s, then the
journey will take
5 hours
5 hours 30 minutes
6 hours
6 hours 15 minutes
Correct Option: A
60 kmph =
60 × 5
m/sec
18
=
50
m/sec.
3
∴ Speed ∝
1
Time
⇒ S1 × T1 = S2 × T2
⇒
50
×
9
= 15 × T2
3 2
⇒ T2 =
75
= 5 hours
15
Second Method :
Here, S1 = 60, t1 = 4
1
=
9
2 2
S2 = 15 ×
18
= 54
5
S1t1 = S2t2
60 ×
9
= 54 × t2
2
t2 =
270
= 5 hours
54
Answered by
1
Answer :
1/2 hour
Step by step explaination
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