Trains Boats and Streams Practice Test 3 with solutions

Question : 31 of 40

Marks: +1, -0

A train from Delhi to Mumbai has an average speed of 350 km/hour without stoppages, whereas the other train from Delhi to Mumbai has an average speed of 280 km/hour with stoppages. What is the average stoppage time per hour if both the trains move at the same speed?

8 minutes
12 minutes
10 minutes
14 minutes
7 minutes.

Validate

Solution:

Let the distance = d km
Time taken without stoppages =

d/{350}

hour
Time taken with stoppages =

d/{280}

hour
Stoppage time =

d/{280}-d/{350}

{5d-4d}/{1400}

d/{1400}

Average stoppage time per hour =

d/{1400} × {280}/d

1/5 × 60

= 12 m inutes

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