NIMCET 2018 — Logical Reasoning PYQ

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Question

NIMCET 2018 — Logical Reasoning PYQ

NIMCET | Logical Reasoning | 2018

A body travels from A to B in 10s with a speed of 50 km/h and returns with a speed of 100 km/h in 5s.
The average speed and the average velocity for the whole journey is

Choose the correct answer:

Explanation

Correct Option - 4
Given:
From A to B in 10s with a speed of 50 km/h.
Returns with a speed of 100 km/h in 5s
Formula Used:
Speed = distance/time
Average speed = total distance/total time
m/s = 5/18 × km/hr
Calculation:
From A to B in 10s with a speed of 50 km/h.
m/s = 5/18 × km/hr
⇒ 5/18 ×50
⇒ 125/9m/s
Distance = speed × time
⇒ Distance = 125/9 × 10
⇒ Distance = 1250/9 meters
Returns with a speed of 100 km/h in 5s
m/s = 5/18 × km/hr
⇒ 5/18 ×100
⇒ 250/9m/s
Distance = speed × time
⇒ Distance = 250/9 × 5
⇒ Distance = 1250/9 meters
Average speed = total distance/total time

⇒Average speed = 2500/(15×9)
⇒Average speed = 2500/135
⇒Average speed = 18.5m/s
∴ Average speed is 18.5m/s