Question

A journey takes 4 hours 30 minutes at a speed of 60 Km/hr. How long will the
same journey take at a speed of 15 m/sec.​

Answer 1

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A journey takes 4 hours 30 minutes at a speed of 60 Km/hr. How long will the

same journey take at a speed of 15 m/sec.

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A journey takes 4 hours 30 minutes

=4×1/2

= 9/2 h at a speed of 60 km/h

If speed is 15 m/sec

Convert m/s into km/h

=15×18/5

=54 km/h

Let time taken =x h

∴60:54= 9/2:x

Less speed, more time

∴54:60= 9/2 :x

⇒54×x=60× 9/2

⇒x= 60×9/54×2

⇒x=5

∴ Time taken =5 hour