A train covers a distance of 670 km in 6h 5min . If it covers the first 390km of the journey at 90 km/h, find its speed for the rest of the journey.
Answers
Total Distance = 670 km
Case 1
He covers distance=390km speed=90km/hr
Time taken=distance
speed=390 =4.34 hr= 4hr+ 0.34×60 min=4hr 20 min
But we know total time taken =6h 5min
∴ Time taken in 2nd case
Total time-Time taken in 1st case=6h 05 min - 4hr 20 min
6×60min + 05min - 4 × 60min + 20min
=360min + 05min - 240min + 20min
=365min-260min
=105 min
Converting 105 min into hour =1.75 hr
∴ Time taken in 2nd case=1.75 hr
Distance in 2 nd case=total distance-distance in 1 st case=670-390=280 kmSpeed in 2 nd case=Distance in 2 nd case
Time taken in 2nd case = 2801.75 = 160 km/hr
Answer:
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