Question

walking at 3/4 of its usual speed, a train is 20minutes too late. find its usual time to cover the journey

Answer 1

Answer: 60 minutes

Step-by-step explanation:

Since, he is walking at 3/4 of its usual speed,

Thus, the ratio of the new speed and usual speed = 3 : 4

⇒ The ratio of the new time and the usual time = 1/3 : 1/4 = 4 : 3

Let the new time = 4x

And, the usual time = 3x

Where x is any number,

Also, according to the question,

New time - usual time = 20 minutes

4 x - 3 x = 20

x = 20

Hence, the usual time = 3x = 3×20 = 60 minutes or 1 hours

Answer 2

Step-by-step explanation:

Walking at 3434 of its usual speed, a train is 20 Minutes to late. Find its usual time to cover the journey?

A.   

50 min

B.   

30 min

C.   

60 min

D.   

40 min

Answer Key

C

Solution

Let the old speed be 'x'km/h'x'km/h

Time taken for the complete the distance with speed 'x'km/h'x'km/h =Distancespeed=Distancex=Distancespeed=Distancex

The new speed is 4x3km/h4x3km/h

Time taken for the complete the distance with speed 4x3km/h4x3km/h =Distancespeed=Distance4x3=34(distancex)=Distancespeed=Distance4x3=34(distancex)

Distancex−34(distancex)=20Distancex−34(distancex)=20 min

13(distancex)=20min13(distancex)=20min

Usual time ==  60 mints

                   (or)

New speed 3434  of usual speed

New time taken =43=43  of usual time

So,