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The driver of a car sees a truck 80 m ahead of him, after 30 seconds, the truck is 120 m behind. If the speed of the car is 60 km/h. What is the speed of the truck?
1. 42 km/h
2. 32 km/h
3. 38 km/h
4. 36 km/h

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Correct Answer - Option 4 : 36 km/h

GIVEN:
Initial distance = 80 m

Distance after 30 sec = 120m

Car's speed = 60 km/h

FORMULA USED:

Speed = Distance/Time

km/h × 5/18 = m/s

CALCULATION:

Distance traveled by car in 30 sec = 60 × 5/18 × 30 = 500 m

Distance traveled by truck in 30 sec = 500 - (120 + 80) = 300 m

Speed of truck = 300/30 =10 m/s

⇒ 10 × 18/5 = 36 km/h

∴ Speed of truck is 36 km/h

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