Question

14. A driver of a auto rickshaw sees a lorry 60 meters ahead of him. After 30 seconds the lorry is 90 meters behind. If the speed of the auto rickshaw is 38 kmph, then what is the speed of the lorry?(Please answer with details)

Answer 1

Answer:

Relative speed =

Total distance

=

60 + 90

= 5 m/s

Total time

30

∴ 5 m/s = 5 ×

18

= 18 kmph

5

Now relative speed = speed of auto rickshaw – speed of lorry

or, 18 = 38 – speed of lorry

∴ Speed of lorry = 38 – 18 = 20 km/h

Answer 2

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