177. Two cars are moving in the same direction with the
same speed of 30 km/h. They are separated by 5
km. What is the speed of a car moving in the
opposite direction if it meets the two cars at an
interval of 4 minute ?
(1) 45 km/h
(2) 60 km/h
(3) 105 km/h
(4) None
Answers
Answer:
Both Car Speed=30 km/h
They are separated by 5 km
So Car Moving with certain speed meet car in interval of 4 min.
Means In 4 min he cover 5 km
Speed=Distance÷time
4 min=4/60=1/15
Speed=5÷1/15
5×15
=75 km/h
Speed of Car will be=75 km/h
But the Relative Speed With Car Travelling with 30 km/h
(75-30)km/h=45 km/h
Answer :- 45 km/h
Explanation :-
Given :-
The speed of two moving car in same direction = 30 km/h
The car get separate in 5 km.
The Car moving in opposite direction if at a certain speed meets at an interval of 4 minutes.
To Find :-
Speed of the car moving in opposite direction
Solution :-
Speed = Distance/Time
Speed = 5 / 4/60
Speed = 5 × 1/15
= 15 × 5
= 75 km /h
Speed = 75 km / h
Therefore, the speed of the car is 75 km/h
The speed of the car moving in opposite direction = ?
The actual Speed of the car - Speed of the car moving in same direction
75 - 30 km/h
45 km/h