state gov Bihar NHM CHO 2025 Mock Test Quantitative Aptitude Speed Time and Distance Problem on Trains
A train covers 400 km at a uniform speed. If the speed had been 10 km/h more, it would have taken 2 hours less for the same journey. What is the usual time taken (in hours) by it to complete the journey?
1
12
2
15
3
8
4
10