Question

Total distance between a to b is 240km. Train p starts running with an average speed of (s) kmph from a to b while another train q starts running after 2 hours of train a and reaches b 60 minutes before train p. If train a stops for 60 minutes at a line crossing and second train did not stop at any place, then the ratio between the speed of train p to speed of train q is 4:5.

Answer 1

Explanation:

Uses of ultrasonic vibrations: Ultrasonic vibrations are used in SONAR to measure the depth of sea (or ocean) and to locate under water objects like submarines, sea-rocks and shipwrecks. It is used for scanning and imaging the position and growth of a foetus and presence of stones in the gall bladder and kidney.

Answer 2

Explanation:

(x-2)/(x+1) = 4/5

5x-10 = 4x+4

x = 14

S = 240/(14+1) = 16kmph