Question

3. A train runs for 4 hours at a speed of 57km/hr and for next 3 hours at a speed of 64 km/h. Find the average speed of the train for the seven hours journey? (a) 60 km/h (b) 40 km/h (c) 50 km/h (d) 30 km/h​

Answer 1

Answer:

The answer is 60km/HR

Step-by-step explanation:

AVG speed= Total distance/Total time

for 1sr train ,

velocity = distance/time

or , distance = velocity ×time = 57× 4 = 228km

For 2nd train

distance = velocity × time = 64 × 3 = 192 km

therefore total distance = 228+ 192 = 420km

total time = 3 hrs + 4 hrs = 7 hrs

so AVG speed = 420km/ 7 hrs

= 60km/HR

Hope you get it ☺️

Answer 2

Answer:

Answer is 60 km/h

A train run = speed of 57km/h

57×4 = 228km

After 3 hour train run = speed of 64km/h

64×3 = 420km

total distance travelled by train

420+228 = 420

Average speed = 420 ÷ 7 = 60 km/h

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