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ICSE Class 7 Answered

a train covers the first 160 km of ajourney at 40 km/h,the next 180 km at 45km/h , and the last 200 km at 50km/h .  1..the total time it takes to complete the jourmey? 2..the average speed of the train during the whole journey?
Asked by rojesh.sahoo | 07 Feb, 2019, 09:13: PM
answered-by-expert Expert Answer
time space taken space to space cover space 160 km space equals space 160 over 40 equals 4 hrs time space taken space to space cover space 180 km equals 180 over 45 equals 4 space hrs time space taken space to space cover space 200 km equals 200 over 50 equals 4 space hrs total space time space equals space 12 space hrs avg space speed space equals fraction numerator 40 plus 45 plus 50 over denominator 3 end fraction equals 45 km divided by hr
Answered by Arun | 08 Feb, 2019, 10:26: AM

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