state gov WBPSC Food SI Mock Test 2023 Quantitative Aptitude Speed Time and Distance

A man completed his journey in 4 parts by travelling a distance 40 km, 50 km, 80 km and 100 km with a speed of 10 km/h, 10 km/h, 16 km/h and 25 km/h respectively. Find the average speed in km/h for the whole journey.  

1
10
2
12 
3
15
4
25
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