Question

3 HOUTS 8. A train 420 m long is running at a speed of 90 km/hr. If it crosses a platform in 45 seconds, find the length of the platform. 9. A man covers the first 70 km of a journey at 35 km/hr and the remaining 40 km at 10 km/hr. Find (1) total time of his journey. (ii) average speed of the whole journey. A hangad must it travel​

Answer 1

Explanation:

D

14 seconds

Speed =90km/hr=90×

18

5

=25m/sec

Distance covered = Length of train + Length of platform

=(120+230)metres=350metres

Time taken =

25

350

=14seconds

Answer 2

Answer:

D  => 14 seconds

Speed =90km/hr=90×

18 *5  =25m/sec

Distance covered = Length of train + Length of platform

= (120+230)metres =350metres

Time taken =  25/ 350

=14seconds

Explanation: