Q1.A train travels in a straight line at a constant speed of 60 km/h for a particular distance d and then travels another distance equal to 2d in the same direction at a constant speed of 80 km/hr in the same direction as it was in the it was previously going a) What is the average speed of the train during the whole journey.
Answers
A train travels in a straight line at a constant speed of 60 km/h for a particular distance d and then travels another distance equal to 2d in the same direction at a constant speed of 80 km/hr in the same direction as it was in the it was previously going
To Find :-
Average speed
Solution :-
◼ I n C a s e 1 :-
↠ Time = Distance/Speed
↠ Time = d/60
◼ I n C a s e 2 :-
↠ Time = Distance/Speed
↠ Time = 2d/80
Average speed = Total distance/Total time
↠ Total distance covered = d + 2d
↠ Total distance covered = 3d
↠ Total time taken = d/60 + 2d/80
↠ Total time taken = 4d + 6d/240
↠ Total time taken = 10d/240
↠ Total time taken = d/24
Using above formula
↠ Average speed = 3d/(d/24)
↠ Average speed = 3d/1 × 24/d
↠ Average speed = 72d/d
↠ Average speed = 72 km/h
Answer:
Q1.The sides of a triangle are 25cm, 39cm and 56cm respectively. Find the Given terms : ( I ) Area of the Triangle. ( II ) The altitude to the longest side of the Triangle.
Step-by-step explanation:
Good morning
message me on atmagyan