Question

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?​

Answer 1

Answer:

4 hours 30 minutes = 4.5 hours.

Or 4 × 60 + 30 = 270 mins

Convert mins into hours

270/60 = 9/2 hours

60 × 9/2 = 270 km

Now 15 m /sec = 15 × 18/5 = 54km h

Time = distance/ speed

270/54 = 5 hours

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Answer 2

60km/h = 60 x 5 / 18

= 50 / 3 m/s

Speed is directly proportional to 1/time

S1 x T1 = S2 x T2

50/3 x 9/2 = 15 x T2

T2 = 75/15

= 5 hours

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